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Posted by altertable 11 hours ago

Qwen 3.8 27B available on Cerebras at 1500 tokens/s(inference-docs.cerebras.ai)
500 points | 150 commentspage 2
foundfontic 11 hours ago|
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 11 hours ago|
discord support can fix such issues
threecheese 10 hours ago|||
If you need customer support to access customer support, something is wrong; no?
Zambyte 10 hours ago|||
Discord is simply a liability.
RomanPushkin 8 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 10 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 8 hours ago||
almost of their business is hosting Sol ultra fast or whatever for OpenAI to use internally
kroaton 9 hours ago||
Especially since they still serve Codex-Spark, which is dogshit.
ecshafer 9 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 9 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 3 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 5 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 8 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 1 hour ago||
Which quantization?
peri-cl 11 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 11 hours ago|
yeah - used sign in with google
codazoda 8 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.

https://www.cerebras.ai/pricing

low_tech_punk 8 hours ago|
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 8 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 4 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.
porphyra 11 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 11 hours ago||
They make a giant inference chip. Their inference service is basically just advertising for their core value prop: hardware.

The CEO was on Gradient Dissent a couple years ago: https://www.youtube.com/watch?v=qNXebAQ6igs

codexon 11 hours ago|||
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 11 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].

[1] https://www.cerebras.ai/blog/accelerating-gpt-5-6-sol-ultraf...

codexon 10 hours ago||
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 10 hours ago|||
[dead]
altertable 11 hours ago||
Mostly economics I'm sure
forlorn 3 hours ago||
Is Kimi 3 available anywhere like that?
the_duke 10 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 10 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

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