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nostrebored 12 hours ago [-]
150k TPM limit on public endpoint means that it's likely unusable for many coding tasks. When we've tried Cerebras in the past, our problem has always been rates. We'd love to not deal with dedicated and to have access to a more flexible rate pool.
Even trying it out, it seems like our account has gotten moved to some limbo where we can no longer add billing information.
```
Billing access restricted
Self-serve billing is not available on Enterprise accounts. Please contact your team for further questions.
```
We have no team (they removed themself from our slack channel after we talked about rate limits). Perplexingly, none of this even shows up in the request, which gives:
```
{"message":"Model does not exist or you do not have access to it.","type":"not_found_error","param":"model","code":"model_not_found"}
```
When the error is really about billing.
I always want to like Cerebras, but I get the vibe that as a tokens in tokens out consumer you are not valued at all.
Aurornis 10 hours ago [-]
> 150k TPM limit on public endpoint means that it's likely unusable for many coding tasks.
I don't understand. How does that make it unusable? Is the limit shared by an entire team at once?
150,000 tokens per minute is a lot. You could start hitting that with a lot of concurrent requests in your session, but even throttled to 150k TPM it's still going to be faster than anything else you find.
I think the 128K context limit is the real ceiling. These models aren't amazing at long context, but once you account for a short input prompt, the input files, and headroom for a compaction summary, there isn't a lot left for the problem.
wild_egg 9 hours ago [-]
It's a limit on input tokens. So that's 3 50k requests per minute. At Cerebras speeds, that's about 5 seconds of usage per minute.
I was very excited last year for their coding plan but seeing a burst of requests pulse and then sitting there watching the cooldown reset is really not a great time.
Even though each individual request was fast, the sessions were only maybe 10% faster on wall clock time since there was so much waiting time.
kristjansson 5 hours ago [-]
They made the coding plan a bit better toward the end, but it was pretty tough to use throughout.
Seems like an Amdahl’s law of inference economics? there’s so much compute relative to SRAM on the chip and shoreline bandwidth onto the chip that caching buys ~nothing? The contended resource is SRAM and a given token of context needs just as much as another.
vlovich123 3 hours ago [-]
That’s not what caching is for. Caching lets you resume with a pre computed KV cache saving you from having to ingest everything in the chat history as input on every single round trip. You still need caching regardless of SRAM or not as it saves a huge amount (and ever growing) of compute ingesting the preceding history every time you want a completion.
I don’t know why they don’t give a price discount. Maybe their hardware is incapable for some reason of saving/restoring the state? Or maybe they just haven’t built the infrastructure to do it?
amelius 9 hours ago [-]
Can't you do something with multiple accounts?
jychang 6 hours ago [-]
You would lose caching (if they cache)
sandworm101 9 hours ago [-]
Or just buy a 5060. This will run on most any 16gb card. Slower for sure but far cheaper than another subscription.
embedding-shape 8 hours ago [-]
Or buy a raspberry pi with a SSD, about the same difference, if you're giving up on the 1500 tokens/s anyways.
ma2kx 6 hours ago [-]
Thats not the point if you choose Cerebras as provider.
gerdesj 9 hours ago [-]
128k context is not a limit of the model, that's a limit of implementation:
"Context Length: 262,144 natively and extensible up to 1,000,000 tokens."
We're talking about the Cerebras implementation, which is limited to 128K.
It's in the link.
selcuka 5 hours ago [-]
TPM means Tokens per Minute.
zxexz 1 hours ago [-]
GP is referring to GGP’s last paragraph. 150k t/m, yes, and 128k context.
datadrivenangel 9 hours ago [-]
150k tokens per minute at 1.5k tokens per second means you can have like 3 users concurrently and that's not a lot.
conception 10 hours ago [-]
150k by account. At 1.5k a second you hit it very quickly.
devy 10 hours ago [-]
Exactly, it burns the tokens 3000x faster, which means the budget ($$$$$$) runs out so faster it will stop super quick, not able to perform long-duration work. At 27B parameter size, the intelligence is not able to accomplish work within a short amount time. Consequently, it become not usable.
gerdesj 9 hours ago [-]
I (we) run Qwen3.8-27B-FP8 on a DGX Spark box - that's roughly £4000 of hardware.
I did benchmark it in various ways and it runs quite well but it is a quantised jobbie and 1.5k t/s is also rather faster than anything I can possibly hope to achieve.
To run that model at those sorts of speeds is going to need some serious investment and you are going to have to pay for it.
conception 5 hours ago [-]
The problem is most providers hit tok/sec limits really fast. 1m/min is the default and the only place I can get 10m+ is from first party providers without a lot of upfront cash.
jacquesm 7 hours ago [-]
How fast is it?
wincy 1 hours ago [-]
Parent already responded but just for reference an RTX 5090 with Ninfer hits 160 tokens/second with qwen 3.8 27B which is very usable.
kristjansson 5 hours ago [-]
With MTP and FP4 I max out at 30ish t/s on mine. Without MTP or in regimes where the drafter performs poorly it’s about 10 t/s. FP8 is about half that
a012 7 hours ago [-]
Unusable is too stretch IMO, you can still use it in tiny tasks that’ll respond almost instantly
9 hours ago [-]
puppymaster 4 hours ago [-]
all the above. They just simply do not care about non enterprise customers. Today they announced qwen, guess what - it's also the same day they pulled Gemma off their shared tier. No migration notice and all developers are scrambling as we speak trying to migrate. They gave a soft head-ups on discord a week ago and when folks complained about zero-day migration they started saying 'you aren't suppose to build production app on shared tier'.
ryukoposting 2 hours ago [-]
On discord? Jeez. How professional.
olivermuty 12 hours ago [-]
Cerebras the tech is awesome, cerebras the company is a trainwreck
dd8601fn 9 hours ago [-]
Is this the chatjimmy asic approach with a bigger model?
ericd 8 hours ago [-]
No, the asic could only ever run one model/set of weights, no updates possible, ever. These are general purpose processors that can have their models updated. But the chips are enormous, with a substantial amount of on-die memory alongside the execution units, for a relatively insane amount of memory bandwidth.
vel0city 4 hours ago [-]
I thought from what I read about the Taalas approach, the model architecture and overall size couldn't be changed, but model weight values could be updated after for further tuning.
Not as flexible as Cerebras though. And I'd love for someone who knows more to clue me in to the truth.
ericd 2 hours ago [-]
Nah, Taalas was putting the weights into silicon as a mask ROM. Their demo chip was hardwired to serve Llama 3.1 8B, and could never be updated. New models, even new versions without any architectural/size changes meant new tape outs.
But in exchange, you get insane speed and great energy efficiency. I could see it being a great approach for basic "good enough" models.
They may have had a little flexibility by supporting finetuning via LoRAs.
cute_boi 3 hours ago [-]
i hope groq wins if they start doing such things with consumer.
collin 11 hours ago [-]
This was my experience a year ago on some other model they could run super fast. Routine coding tasks would hit the per-minute token limits.
Just the math there... 150k TPM... and 15k TPS means... you can run for 10 seconds every minute?
The basic math boggles the mind.
msdz 2 hours ago [-]
> means... you can run for 10 seconds every minute?
It’s one order of magnitude less TPS, but still, that’s the limit with just one user…
baegi 11 hours ago [-]
Not sure how the rate limiting works, but it's 1.5k TPS, not 15k, so you could run it for 100s/min, which seems good enough to me
nostrebored 11 hours ago [-]
iirc input (uncached) goes towards the limit as well
fc417fc802 10 hours ago [-]
What's the tok/s when they process input?
collin 5 hours ago [-]
ah, yes, that seems right
I was using it quite a while back, different model, different quotas, but for coding tasks it routinely hit quotas which made it quite difficult to actually use.
100s/min seems pretty poor actually with sub-agents etc.
fc417fc802 10 hours ago [-]
It seems you forgot to account for the fact that cerebras uses a baker's minute which is 144 seconds instead of 60. (Seriously though what's the supposed issue here?)
RussianCow 10 hours ago [-]
The issue is that all input (including context) counts towards that limit. So 10 requests with 50k of context will blow through the limit, even if little to no output was generated, which is incredibly easy to do with agentic workloads.
ricardobeat 11 hours ago [-]
What kind of coding tasks would you expect to hit that limit? In my setup, on a very large codebase, it takes each agent 3-4 minutes at minimum to go past 100k tokens.
(note it's 150k uncached tokens, the total limit is 450k/min)
conception 5 hours ago [-]
So that’s about 400 tok/sec. Times that by 3, you get 100k in under a minute. That’s doing nothing special and just using your current setup.
nostrebored 11 hours ago [-]
in my last tests with cerebras for coding tasks, most large tasks or anything greenfield would hit token limits. note that smaller models and the gpt-oss-120b style models they used to run are very prone to overthinking, so individual turns may be 3-10k tokens of just thinking + input + output.
i don't think it's quite apples-to-apples to compare to a frontier model or even a k3. the odds of success (file compiles? read the right context?) are lower and thinking is longer.
0xbadcafebee 11 hours ago [-]
Yeah, their public service isn't a serious/competitive offering. They don't have the capacity to serve all the customers who might want to use them at that speed. The public service exists so they get some users on OpenRouter, and that shows them as #1 on speed, which proves their tech is very fast, which gets them billions in hardware sales/licensing. If you have big enough pockets they can probably dedicate capacity to you. But for reliably fast small models you might want to rent some GPUs.
LoganDark 2 hours ago [-]
GPUs can't reach these speeds. You could build a supercomputing cluster and still not reach these speeds.
gpugreg 32 minutes ago [-]
MiMo-V2.5-Pro-UltraSpeed gets pretty close with over 1000 TPS on 8x B200. It has 1.02T total parameters and 42B active, compared to 27B total/active for Qwen3.8-27B. Also, B300 are out now. I think 1500 TPS for Qwen3.8-27B should be doable.
11 hours ago [-]
gpugreg 12 hours ago [-]
I was wondering whether this was any good for programming, but it is too fast for its own good. There is a limit of 450,000 tokens per minute. I hit this limit in about 90 seconds and burned through $1.10 while doing so. This is because cached tokens count towards the token limit.
For comparison, I ran the same task with DeepSeek-V4-Flash, which finished in 172 seconds and cost $0.024 with a final context window size of 55217 tokens, while Qwen3.8-27B was not even close to being done with a 64178 context window.
This is a very efficient way to burn your money, but I would not recommend it for programming.
On the positive side, I got a $5 signup bonus, so it wasn't my own money.
eveningtree 1 hours ago [-]
The point of speed is to increase throughput. What the point of all this speed, if overall throughput is still so low?
This doesn't work for my use case at all (code generation).
These bursts of speed might work well for workflows that need bursts of quick decisions, followed by silence. But these workflows have needed provable determinism to som extent, so I haven't been using llms for those use cases. And I don't see myself using llms for them in the future too.
irthomasthomas 11 hours ago [-]
Without prompt caching this becomes more expensive than fable 5.1 after turn 50, assuming you start with 40k tokens and add 2k per turn.
d2p 12 hours ago [-]
> There is a limit of 450,000 tokens per minute. I hit this limit in about 90 seconds
I'm confused. If it's 1500t/s, isn't that only 90k per minute? How do you hit a 450k/minute limit?
gpugreg 12 hours ago [-]
Cached tokens count towards the limit as well. For example, if your context window is 50,000 tokens, it takes 9 requests to reach that limit without generating a single token.
nullbio 4 hours ago [-]
Cached tokens counting toward the limit is ridiculous.
perching_aix 9 hours ago [-]
then it's basically useless lol, wtf, this has to be a defect
Could this also be coming from the problem that Qwen3.8-27B's default mode being "extra-high reasoning level"?
jasongill 13 hours ago [-]
It would be great if they made their inference capacity for this model available via OpenRouter; the fastest provider on OpenRouter right now is at ~80tps https://openrouter.ai/qwen/qwen3.8-27b#providers
We're serving it around 150-200tok/s (uses our new speculative decoding implementation on a DFlash2 draft model).
https://mixlayer.com, LAUNCH-Q38-27B gets you $5 in credits if you want to kick the tires.
danielklnstein 12 hours ago [-]
I tried in your playground and got 14.2 tok/s?
zackangelo 12 hours ago [-]
apologies we just got a sudden burst of new users and traffic, it's scaling up now.
zackangelo 11 hours ago [-]
just added 8 more H200s to the cluster, if you (or anyone else) runs into issues please feel free to drop me a message: zack at mixlayer.com
danielklnstein 11 hours ago [-]
Works much better now! Got 103.9 tok/s, not quite 200 - but still amazing!
Thanks for sharing
zackangelo 11 hours ago [-]
Something a lot of model providers don't talk about: any time an engine uses speculative decoding the throughput will depend on how much your output token distribution matches what the draft model was trained on.
The DFlash2 draft model we're using was trained on a lot of code, so if you use it in a coding agent you'll probably notice it run a lot faster (we've seen it break 300 tok/s).
danielklnstein 11 hours ago [-]
FYI, I might be missing something but I think your billing system might not be working well - I'm not seeing any indication in the UI that my usage is being deducted from the $5 of free credits.
chrisboulton 11 hours ago [-]
Hey Daniel! It's a bit hidden, but at the bottom of the billing page there's a "Credits" section which should show usage of any active credits and the balance remaining. The usage/billing metrics are batched/handled async so it might take a minute or so for usage to be reflected. Let us know if it feels off.
RussianCow 10 hours ago [-]
I don't see any kind of input cache discount listed on your pricing page. Do you offer that, or is all input priced the same?
12 hours ago [-]
scratchyone 9 hours ago [-]
any way to see the tok/s for all the models listed on your homepage? curious which has the best speed/quality tradeoff for me
bookernath 12 hours ago [-]
This feels great
pllbnk 12 hours ago [-]
Just a couple days ago I learned about ninfer (https://github.com/Neroued/ninfer) and on RTX 5090 I can now get ~200 tok/s and over 400 tok/s on concurrent requests which is plenty fast for a local model of this strength.
beastman82 12 hours ago [-]
can't second ninfer enough. amazing tech
jakswa 8 hours ago [-]
dang only for certain nvidia GPUs, had my hopes up
lowbloodsugar 9 hours ago [-]
Ok, I need to try that. I'm getting 45tok/s with vLLM on my 6000. >600tok/s concurrent, but 45tok/s single request.
pllbnk 3 hours ago [-]
Even without ninfer I would get over 80 on LM studio with default settings, so it should be noticeably more on 6000. You might want to try different a different inference engine or settings.
hexa00 12 hours ago [-]
Just tried it on a medium size coding/debug problem on an existing codebase, observations:
- Input doesn't look faster than other models, it spends a lot of time reading
Read about 5M tokens
- Output is awesome, super fast as you expect from the 1500t/sec I think that's correct
- Tool call is failing more than say DS4, which leads to time wasted on retries (complex tools like browser control for example)
- Shell commands are still somewhat of a bottleneck
The net effect is that I spend about the same time waiting, and I still need to read that output so, at least for coding, it actually reconciles me with the 100-200t/sec you can get on DS4 or the like. Maybe that's a good sweet spot after all and faster t/sec is not where the bottleneck is.
Also maybe my setup (OMP) doesn't do the cache correctly but that's a huge cost driver... so atm it's quite pricy
peri-cl 12 hours ago [-]
> "Also maybe my setup (OMP) doesn't do the cache correctly but that's a huge cost driver... so atm it's quite pricy"
I don't believe Cerebras has a cached input pricing? They don't list one on the model page:
lol yeah just saw that, yeah that makes it unusable I think at least for me.
I wonder if they will do that with sol ultrafast!
olivermuty 12 hours ago [-]
They have cache, but it costs the same indeed, no idea what the point of the cache is
lostmsu 12 hours ago [-]
They don't have cache (e.g. KV cache). But they write down what you sent earlier to say they cached it! To still bill the same as uncached later (because they didn't actually cache it)!
orbifold 4 hours ago [-]
More precisely they can't cache it.
lostmsu 2 hours ago [-]
Yes. Their architecture recomputes every time so at 150k context every request will have to spend 1.5 min waiting for the model to reread the context.
Say avg model response length is 1024 tok. At 50 tok/s normal providers do your turn will only take 20s (vs Cerebras 101s) and will cost 20x less. That time and cost is per single tool call.
irthomasthomas 12 hours ago [-]
I can't believe this situation has not improved in years. Is cerebras' main business selling the hardware, then?
redman25 11 hours ago [-]
Maybe they’re gunning for speedy non-interactive pricing? Or its a limit of the technology or a business decision?
orbifold 4 hours ago [-]
they have exactly two customers, both of whom are also investors.
tandema 6 hours ago [-]
Cerebras is super constrained on capacity right now, all the support is going to enterprise customers.
nkhs89 12 hours ago [-]
[dead]
apatheticonion 1 hours ago [-]
I just want an API that takes these crazy small / cost effective open weight models and charges peanuts for access.
Think, DeepSeek Flash (before the price hikes) prices.
If I can run this on a 32gb card while they have a datacenter with wholesale electricity prices, why are we not seeing "cents per billion tokens" pricing?
eli 12 hours ago [-]
I just did a little anecdotal test. Had pi + cerebras review a recent commit and asked a few quick followups on it. Worked great.
The Cerebras session cost me $1.60 and took a total of 5.1 mins. I did get a few brief 429 rate limit errors in there. The p50 speed was 890 tok/s and 0.64s TTFT.
Using OpenRouter averages, that would've cost $0.29 (no cache discount at Cerebras!) and would've taken about 14.4 minutes.
So on this one short session, cerebras was 5.6x more expensive in exchange for being 2.8x faster. Or, another way, $1.32 buys back about 9 minutes of your time. Not a bad trade IMHO but the cache situation is a real bummer. The longer your session the more relatively expensive Cerebras gets. The "good" news is you're also limited by its short context window.
(Also, I used to be on the Cerebras coding plan and the support is pretty bad for end users. My guess is these public endpoints are really just product demos for potential enterprise customers.)
irthomasthomas 12 hours ago [-]
Thanks! Is there something about their platform that prevents caching? Or are they just not passing on the discount?
eli 11 hours ago [-]
The session had a 91.4% cache hit rate. They just give zero discount.
gardnr 13 hours ago [-]
I used their Coding Plan for a few months. It is genuinely difficult to keep up with the models. The output is so fast. Qwen 3.8 27B is likely one of the strongest models they've hosted so far.
Edit: it looks like this is only available on a API token pricing. Does anyone know if they have rolled out prompt caching yet? It used to get pretty expensive for agentic coding tasks with no prompt caching.
> There is no additional fee for using prompt caching. Input tokens, whether served from the cache or processed fresh, are billed at the standard input token rate for the respective model.
Well, talk about flipping the narrative.
Barbing 12 hours ago [-]
heh
Is there a speed increase or is that purely marketing spin on “we might cache on our end but no discount for you”?
lostmsu 12 hours ago [-]
Pure marketing.
qlte 6 hours ago [-]
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7 hours ago [-]
12 hours ago [-]
eli 12 hours ago [-]
Strongest model that they host on the public endpoint. They do a super fast version of GPT 5.6 Sol for OpenAI and have bigger open models on dedicated endpoints.
altertable 13 hours ago [-]
Agreed, but in our SAAS I can tell some UX will sky-rocket to next level with this
singpolyma3 12 hours ago [-]
The coding plan is gone now right?
gardnr 12 hours ago [-]
Last time I got one, I had to log into a Discord server and wait for "the drop" and IIRC Daniel Kim was giving them out based on who was there at the time. They were gone in less than a minute. This was ~8 months ago.
cute_boi 13 hours ago [-]
i believe they used to have monthly plan, what happened to that?
tacone 13 hours ago [-]
Noticed they are present in OpenRouter, but Qwen 3.8 is not there yet. Hopefully it'll get there soon.
For those who haven't noticed though, the context size they allow for Qwen is just 128k. Still interesting as a specialized sub-agent but not really well suited for long tasks.
walrus01 1 hours ago [-]
128k is effectively useless on even trivial toy size "not for real business use" coding projects, by the time you reach 105k to 115k tokens with loading code into context and new research/tasks, and ask it to modify something, it'll be vacating older stuff out of context and forgetting the whole picture of what you're working on.
fulafel 1 hours ago [-]
Isn't context size one of the central motivations of the whole agent / orchestration business - fanning out increasingly detailed work to a tree of subagents.
Orchestrator vs worker, hierarchical multitier trees, etc.
I guess this smaller context but faster llm engine could be good to develop your harness on to get faster results and faster iteration.
walrus01 1 hours ago [-]
128k isn't even big enough to give a sub-agent a specific task on some very 'small' projects I work on, based just on the size of the python to work with (including extensive comments in the code) and documentation files, it'll run out of context before it can even accomplish one thing and report back to the main orchestrator.
128k is pretty much only good for chat/conversational/question asking (including tool calls for searching things and spitting back/parsing a set of results) or human interactive agent purposes.
srcreigh 12 hours ago [-]
Great observation. That’s not enough context even for some one shot xhigh requests.
When I put Qwen3.8 27B xhigh towards adding scope proxying to the Guice library, it one shotted a great impl using 250k context before stopping.
Part of the greatness of the model is that it just keeps going until it gets a great result. 128k context is disappointing.
dshat 12 hours ago [-]
I'm saddened that Gemma4 is replaced by Qwen 3.8 on PayGo plan. Gemma4 31B is not coding model but it is excellent at intent understanding and task execution used in agentic software. This just shows that real world dominant usage for llms so far is to code generate. And not to augment business products. They must had barely anyone using Gemma to remove it from that tier.
freehorse 12 hours ago [-]
I have used their gemma 4 31b model through kagi and getting real instantaneous answers is absolutely crazy. A very different feeling and UX. Even if the model is smaller, there is definitely a use case for these. I was wondering if they would put the qwen 27b model, it sounds very interesting to try.
blaesus 2 hours ago [-]
May I ask what you used Gemma 31B for? Last time I try it wasn't bad but then it wasn't particularly good either.
bitexploder 12 hours ago [-]
The thing I didn’t realize for a while is 27B is rather smart. As many (or more) activated parameters as the flash models of the universe that we know about. It reasons very well. It just doesn’t have a lot of knowledge.
nicce 11 hours ago [-]
They seem to have good enough general intelligence that missing knowledge is not that big thing. If you are able to have a proper [free search engine], they can do almost anything. Having own local search index about relevant stuff can help a lof if you don’t want to pay for search API.
bitexploder 10 hours ago [-]
But running that fast… with a local RAG? Yeah, it is a very interesting model. Maybe you don’t need a lot of parameters, just a really big local database :)
codazoda 10 hours ago [-]
Really an aside, but yesterday I got the Gemma-4-12b (128k context) to build it's first web app in the minimal Dark Software Factory I've been building for myself.
I really wish they had their customer support somewhere else than Discord, which seems to think I'm a bot and doesen't accept my email or phone numbe
londons_explore 12 hours ago [-]
discord support can fix such issues
threecheese 12 hours ago [-]
If you need customer support to access customer support, something is wrong; no?
Zambyte 12 hours ago [-]
Discord is simply a liability.
RomanPushkin 10 hours ago [-]
The question is whether Cerebras is available... I've been trying to get https://www.cerebras.ai/code for at least 1 year now. It's all sold out. Always. I once joined their Discord, waited for the drop, and it all sold out in seconds. I haven't had enough time to put my card details. Somebody recommended that I should put my card details in advance, lol.
The next time I hear about them I am laughing, because when I could enjoy these powers? How many years I should be sitting in a waitlist...
orliesaurus 12 hours ago [-]
Qwen 3.8 27B is an exceptional model for coding and ranks as one of the best local models for coding....BUT in my head I am confused why a company that's IPO'd doesn't invest in RL'd super specialized, super-damn-fast models for very specific tasks - instead of giving us the OSS GPT model from what feels like 200 years ago
anthonypasq 10 hours ago [-]
almost of their business is hosting Sol ultra fast or whatever for OpenAI to use internally
kroaton 11 hours ago [-]
Especially since they still serve Codex-Spark, which is dogshit.
walrus01 1 hours ago [-]
I don't see the point of paying for external inference on Qwen 3.8 27B with a bunch of arbitrary limits, when you can run it locally without ridiculous memory requirements. Even the unsloth Q8-XL version of it with full context and extra llama-server --cache-ram (like 10GB instead of 8GB) fits in 64GB.
Paying for external inference for a much larger model like qwen 3.8-flash-next Q8 with full context makes a lot more sense, since the model consumes something like 188GB RAM when fully loaded into an inference engine.
Yeah I guess this is cool and all that it runs at some ridiculous token/s rate but if the actual usage of it is highly limited... What's the point? I'd rather have a much slower tok/s rate that can chew on things 24x7.
ecshafer 11 hours ago [-]
I have a self hosted Qwen 3.8 27B and I find it to be unusably bad. Using it agentically, it will spin around in circles on even small tasks talking to itself until it loses context and starts again. I even had it say "I've forgotten the users initial question"
FeepingCreature 11 hours ago [-]
I have a self hosted Qwen 3.8 27B and I find it unbelievably cracked and dedicated. It's at least credibly attempted everything I've thrown at it. Just today I had it write a toy compiler with a JIT backend just to test out a concept, and that was with 4-bit quantization and 8-bit KV cache. Something has to be going wrong with your deployment.
hedgehog 5 hours ago [-]
Check sampling parameters and chat template, make sure you have adequate context window, turn reasoning effort down. It should be able to one shot a small app without intervention.
pyrolistical 6 hours ago [-]
I run it locally at q4_k_xl on a r9700 with kv cache bf16 and while it thinks a lot, it’s still fast enough to do the task.
This model had its knowledge replaced with reasoning ability. The chain of thought what makes this reasoning effective.
So this is why you need to let it think and don’t quantize the kv cache.
codazoda 10 hours ago [-]
I want a Qwen 3.8 27B hosted locally but I don't quite have the RAM for it. And, I don't want to buy the RAM until I prove I can use it.
Yesterday I did have success with Gemma-4-12b with 128k context. It fits in my RAM and it's relatively fast on my hardware.
I had to give it prompts that are quite a bit different from the way I use foundation models, but I did get it to work quite well. I feel like I could learn it's differences and get good at using it for real work.
Almondsetat 3 hours ago [-]
Which quantization?
peri-cl 13 hours ago [-]
(Was anyone able to create an account just now? I tried but onboarding falls into a redirect loop)
(update: I got my answer. support@ replied and said my email domain is on their blacklist. It was just me (and I've resolved it)).
bakies 13 hours ago [-]
yeah - used sign in with google
porphyra 13 hours ago [-]
Why do they only host small models rather than the 2.4T version? Is the I/O and interconnect between the wafers bad due to the limited beachfront relative to the massive size of the chip?
gardnr 13 hours ago [-]
They make a giant inference chip. Their inference service is basically just advertising for their core value prop: hardware.
The wafer only has space for 44 gb of sram. If they offload ram they lose the speedup of having everything on 1 chip (the whole point of cerebras).
porphyra 13 hours ago [-]
They can host larger models by pipelining it on multiple wafers. Each wafer stores one layer and N layers can serve an N * 44 gb model with N concurrency. The limitation would of course be inter-wafer I/O, which my comment was getting at. That's probably how they can serve bigger models like GPT 5.6 Sol [1].
I never said offloading was impossible. It will result in a large slowdown.
It would look bad for cerebras if other people are hosting the 27b version and show a higher TPS than cerebras.
minimaltom 12 hours ago [-]
[dead]
altertable 13 hours ago [-]
Mostly economics I'm sure
codazoda 10 hours ago [-]
Do I understand their pricing correctly? This is $10 per month for a developer account PLUS you pay $1.49/M for output tokens and $0.99/M for input tokens on Qwen 3.8 27b with a 128k context?
EDIT: Or, maybe it's just token pricing, but $10 is the minimum? Maybe it's that.
No. You buy a minimum of $10 worth of credit, then use it at $1.49/M rate. There is no recurring charge.
There is a separate subscription based plan, which is sold out now.
codazoda 10 hours ago [-]
Got it. But, they also charge the same for cached tokens, so that probably closes the gap on Foundation models quite a bit.
ma2kx 6 hours ago [-]
I guess Cerebras didnt intend the model for agentic coding but rather for small one shot task like title generation. At least thats why I use the free tier for.
10 hours ago [-]
the_duke 12 hours ago [-]
Funnily enough the pricing isn't that much worse than on openrouter, where the best price at the moment is $0.24 in / $2.55 out, vs $1 / $1.5 on Cerebras.
Sure, 4x input , but cheaper output.
Though Cerebras doesn't have prompt caching, so not great for agentic workloads. (they do, but it doesn't affect the price.
srcreigh 12 hours ago [-]
It is 15x more expensive. Openrouter usually charges like 1/4 for cached input.
Most of the cost for agentic coding is input tokens, you pay for the whole context at each tool call or message. Output tokens is just a small rate
It's going to cost a fortune in opencode without prompt caching.
WithinReason 1 hours ago [-]
Now imagine having it running 10x faster on a Taalas chip on a card you can buy for $1k. I hope that future happens
darkbatman 12 hours ago [-]
I have been their user for more than year even used coding plans, though for normal coding the quota will definitely be a blocker if you are using opencode because rpm are bit less. Good for products/api though.
forlorn 4 hours ago [-]
Is Kimi 3 available anywhere like that?
polygot 13 hours ago [-]
Ut oh, might be down: "Unable to connect to the server. Please check your connection and try again." when sending a message to Qwen 3.8 27B.
vb-8448 12 hours ago [-]
At that speed it's too pricey for agentinc tasks.
yipinwong 12 hours ago [-]
The target audience is who needs raw speed.
Having the choice is good as you can make a trade-off between speed, perf, and quality.
Until last year, people had a single AI god they believed in (mostly Anthropic stuff). Now we have power to make choices (open-weights, SOTA, speed-optimized, etc) the same way you do for system designs.
vb-8448 12 hours ago [-]
It's not a criticism, I was really looking forward to trying out such a powerful model at this speed.
But I burn my 5$ allowance in 10 minutes ... and only because I was hitting rate limits, without it would probably be less than a minute.
yipinwong 11 hours ago [-]
I hear ya... the best option is to use company budget as normies will rack up ridciulous amount soon with that raw speed.
fulafel 12 hours ago [-]
What are the best benchmarks/leaderboards that compare task completion time between provider+model combos?
karim79 7 hours ago [-]
Tokens are the new latest and greatest nonsensical shit on the planet. It's amusing. I can't wait to see the world in 1-2 years and the hilarity of looking back on this day.
srcreigh 12 hours ago [-]
How many years until chips like this are available to consumers?
nicce 12 hours ago [-]
Many. Too lucrative for certain companies and even governments to allow that to happen
drchaim 12 hours ago [-]
The idea of custom software on the fly is coming
Marciplan 13 hours ago [-]
used their Code product with GLM4.7. its fun but if the model is bad it just doesn’t do much useful.
Hope they add such models to Code too :)
altertable 13 hours ago [-]
Yeah GLM 4.7 is from another decade at the speed we're going
trvz 13 hours ago [-]
Normal people: tok/s or t/s
Psychopaths: tok/SEC
scotty79 13 hours ago [-]
I like tps
verdverm 12 hours ago [-]
do you get reports on them?
altertable 13 hours ago [-]
ok fair, caps lock kept ON /o\
jing09928 6 hours ago [-]
[flagged]
byako 13 hours ago [-]
[flagged]
miohtama 12 hours ago [-]
Your brain can wash laundry and cook pasta, so there is still a long way to go
qiine 12 hours ago [-]
(requires additional fleshy bits sold separately)
davrosthedalek 11 hours ago [-]
regarding my brain, my mother might disagree on the laundry part.
dgellow 12 hours ago [-]
Your brain updates itself constantly and maintains your whole body, LLMs are static.
Still, 1500tokens/s is indeed wild
eli 12 hours ago [-]
If you read the reasoning trace for Qwen 3.8, it does a whole lot of "uh" and "But, wait..." too
howunfortunate 12 hours ago [-]
You're absolutely right - filler words are genuinely load-bearing
Zambyte 12 hours ago [-]
At 1500 tps, "uh" is about 0.7 ms, instead of 200-300 ms for a human.
Even trying it out, it seems like our account has gotten moved to some limbo where we can no longer add billing information.
``` Billing access restricted Self-serve billing is not available on Enterprise accounts. Please contact your team for further questions. ```
We have no team (they removed themself from our slack channel after we talked about rate limits). Perplexingly, none of this even shows up in the request, which gives:
``` {"message":"Model does not exist or you do not have access to it.","type":"not_found_error","param":"model","code":"model_not_found"} ```
When the error is really about billing.
I always want to like Cerebras, but I get the vibe that as a tokens in tokens out consumer you are not valued at all.
I don't understand. How does that make it unusable? Is the limit shared by an entire team at once?
150,000 tokens per minute is a lot. You could start hitting that with a lot of concurrent requests in your session, but even throttled to 150k TPM it's still going to be faster than anything else you find.
I think the 128K context limit is the real ceiling. These models aren't amazing at long context, but once you account for a short input prompt, the input files, and headroom for a compaction summary, there isn't a lot left for the problem.
I was very excited last year for their coding plan but seeing a burst of requests pulse and then sitting there watching the cooldown reset is really not a great time.
Even though each individual request was fast, the sessions were only maybe 10% faster on wall clock time since there was so much waiting time.
Seems like an Amdahl’s law of inference economics? there’s so much compute relative to SRAM on the chip and shoreline bandwidth onto the chip that caching buys ~nothing? The contended resource is SRAM and a given token of context needs just as much as another.
I don’t know why they don’t give a price discount. Maybe their hardware is incapable for some reason of saving/restoring the state? Or maybe they just haven’t built the infrastructure to do it?
"Context Length: 262,144 natively and extensible up to 1,000,000 tokens."
https://huggingface.co/Qwen/Qwen3.8-27B
It's in the link.
I did benchmark it in various ways and it runs quite well but it is a quantised jobbie and 1.5k t/s is also rather faster than anything I can possibly hope to achieve.
To run that model at those sorts of speeds is going to need some serious investment and you are going to have to pay for it.
Not as flexible as Cerebras though. And I'd love for someone who knows more to clue me in to the truth.
But in exchange, you get insane speed and great energy efficiency. I could see it being a great approach for basic "good enough" models.
They may have had a little flexibility by supporting finetuning via LoRAs.
Just the math there... 150k TPM... and 15k TPS means... you can run for 10 seconds every minute?
The basic math boggles the mind.
It’s one order of magnitude less TPS, but still, that’s the limit with just one user…
I was using it quite a while back, different model, different quotas, but for coding tasks it routinely hit quotas which made it quite difficult to actually use.
100s/min seems pretty poor actually with sub-agents etc.
(note it's 150k uncached tokens, the total limit is 450k/min)
i don't think it's quite apples-to-apples to compare to a frontier model or even a k3. the odds of success (file compiles? read the right context?) are lower and thinking is longer.
For comparison, I ran the same task with DeepSeek-V4-Flash, which finished in 172 seconds and cost $0.024 with a final context window size of 55217 tokens, while Qwen3.8-27B was not even close to being done with a 64178 context window.
This is a very efficient way to burn your money, but I would not recommend it for programming.
On the positive side, I got a $5 signup bonus, so it wasn't my own money.
This doesn't work for my use case at all (code generation).
These bursts of speed might work well for workflows that need bursts of quick decisions, followed by silence. But these workflows have needed provable determinism to som extent, so I haven't been using llms for those use cases. And I don't see myself using llms for them in the future too.
I'm confused. If it's 1500t/s, isn't that only 90k per minute? How do you hit a 450k/minute limit?
https://news.ycombinator.com/item?id=49556302
They do appear to host other models on OpenRouter so maybe Qwen3.8 will be there soon: https://openrouter.ai/provider/cerebras
https://mixlayer.com, LAUNCH-Q38-27B gets you $5 in credits if you want to kick the tires.
The DFlash2 draft model we're using was trained on a lot of code, so if you use it in a coding agent you'll probably notice it run a lot faster (we've seen it break 300 tok/s).
The net effect is that I spend about the same time waiting, and I still need to read that output so, at least for coding, it actually reconciles me with the 100-200t/sec you can get on DS4 or the like. Maybe that's a good sweet spot after all and faster t/sec is not where the bottleneck is.
Also maybe my setup (OMP) doesn't do the cache correctly but that's a huge cost driver... so atm it's quite pricy
I don't believe Cerebras has a cached input pricing? They don't list one on the model page:
https://inference-docs.cerebras.ai/models/qwen-3.8-27b
edit: See the sibling discussion,
https://news.ycombinator.com/item?id=49554520#49555094 ("Input tokens, whether served from the cache or processed fresh, are billed at the standard input token rate")
I wonder if they will do that with sol ultrafast!
Say avg model response length is 1024 tok. At 50 tok/s normal providers do your turn will only take 20s (vs Cerebras 101s) and will cost 20x less. That time and cost is per single tool call.
Think, DeepSeek Flash (before the price hikes) prices.
If I can run this on a 32gb card while they have a datacenter with wholesale electricity prices, why are we not seeing "cents per billion tokens" pricing?
The Cerebras session cost me $1.60 and took a total of 5.1 mins. I did get a few brief 429 rate limit errors in there. The p50 speed was 890 tok/s and 0.64s TTFT.
Using OpenRouter averages, that would've cost $0.29 (no cache discount at Cerebras!) and would've taken about 14.4 minutes.
So on this one short session, cerebras was 5.6x more expensive in exchange for being 2.8x faster. Or, another way, $1.32 buys back about 9 minutes of your time. Not a bad trade IMHO but the cache situation is a real bummer. The longer your session the more relatively expensive Cerebras gets. The "good" news is you're also limited by its short context window.
(Also, I used to be on the Cerebras coding plan and the support is pretty bad for end users. My guess is these public endpoints are really just product demos for potential enterprise customers.)
Edit: it looks like this is only available on a API token pricing. Does anyone know if they have rolled out prompt caching yet? It used to get pretty expensive for agentic coding tasks with no prompt caching.
> There is no additional fee for using prompt caching. Input tokens, whether served from the cache or processed fresh, are billed at the standard input token rate for the respective model.
Well, talk about flipping the narrative.
Is there a speed increase or is that purely marketing spin on “we might cache on our end but no discount for you”?
For those who haven't noticed though, the context size they allow for Qwen is just 128k. Still interesting as a specialized sub-agent but not really well suited for long tasks.
I guess this smaller context but faster llm engine could be good to develop your harness on to get faster results and faster iteration.
128k is pretty much only good for chat/conversational/question asking (including tool calls for searching things and spitting back/parsing a set of results) or human interactive agent purposes.
When I put Qwen3.8 27B xhigh towards adding scope proxying to the Guice library, it one shotted a great impl using 250k context before stopping.
Part of the greatness of the model is that it just keeps going until it gets a great result. 128k context is disappointing.
https://joeldare.com/a-local-open-weight-model-builds-its-fi...
The next time I hear about them I am laughing, because when I could enjoy these powers? How many years I should be sitting in a waitlist...
Paying for external inference for a much larger model like qwen 3.8-flash-next Q8 with full context makes a lot more sense, since the model consumes something like 188GB RAM when fully loaded into an inference engine.
Yeah I guess this is cool and all that it runs at some ridiculous token/s rate but if the actual usage of it is highly limited... What's the point? I'd rather have a much slower tok/s rate that can chew on things 24x7.
This model had its knowledge replaced with reasoning ability. The chain of thought what makes this reasoning effective.
So this is why you need to let it think and don’t quantize the kv cache.
Yesterday I did have success with Gemma-4-12b with 128k context. It fits in my RAM and it's relatively fast on my hardware.
I had to give it prompts that are quite a bit different from the way I use foundation models, but I did get it to work quite well. I feel like I could learn it's differences and get good at using it for real work.
(update: I got my answer. support@ replied and said my email domain is on their blacklist. It was just me (and I've resolved it)).
The CEO was on Gradient Dissent a couple years ago: https://www.youtube.com/watch?v=qNXebAQ6igs
[1] https://www.cerebras.ai/blog/accelerating-gpt-5-6-sol-ultraf...
It would look bad for cerebras if other people are hosting the 27b version and show a higher TPS than cerebras.
EDIT: Or, maybe it's just token pricing, but $10 is the minimum? Maybe it's that.
https://www.cerebras.ai/pricing
There is a separate subscription based plan, which is sold out now.
Sure, 4x input , but cheaper output. Though Cerebras doesn't have prompt caching, so not great for agentic workloads. (they do, but it doesn't affect the price.
Most of the cost for agentic coding is input tokens, you pay for the whole context at each tool call or message. Output tokens is just a small rate
Having the choice is good as you can make a trade-off between speed, perf, and quality.
Until last year, people had a single AI god they believed in (mostly Anthropic stuff). Now we have power to make choices (open-weights, SOTA, speed-optimized, etc) the same way you do for system designs.
But I burn my 5$ allowance in 10 minutes ... and only because I was hitting rate limits, without it would probably be less than a minute.
Hope they add such models to Code too :)
Psychopaths: tok/SEC
Still, 1500tokens/s is indeed wild