Simon Willison's post about this gives a good context on why exactly this is happening. While it doesn't mention this in the Artificial Analysis page, this is likely with Max reasoning, which has extremely long reasoning traces:
I'm curious if they can make up for this with insanely high tokens-per-second especially when served from hosted providers, though, given how tiny it is (37B!)
Qwen models are slower in tokens/s, compared to similarly sized gemma4 and others, and they use more tokens per task, in part thanks to that xhigh default.
On the other hand, there are some of us who are stuck with hardware that has plenty of compute, but limited (V)RAM. The new 27B is just perfect for that.
What configuration are you using? On both vllm and llama-cpp, I get significantly higher speeds from gemma4 than qwen3.6 (with their respective speculative decoding methods).
Output TPS in vllm for instance:
- Gemma4 26B-A4B: 200-300TPS
- Qwen3.6 35B-A3B: 120-180TPS
- Gemma4 31B: 80-120TPS
- Qwen3.6 27B: 60-80TPS
This is for a first request on a dual 5090 setup, with their respective speculative decoding methods.
I'm running 3.8 27B locally, and the results from the past few days have been excellent. I find raw speed is less of an issue when you can trust the model more to reach the right result.
> insanely high tokens-per-second especially when served from hosted providers, though, given how tiny it is (37B!)
It's a dense model so it will use all of its parameters per token. 37B active parameters isn't tiny at all, it's almost what Deepseek R1 had, and it's 2/3 of what Kimi k3 uses, so it's not going to be “insanely high” tps: it's going to be three times slower than Deepseek Flash (Prefil speed is going to be quite high though, but not token generation).
It’s still going to chew up context quickly. Surely, some of the added tokens are helping the model, but does it require as many as it generates? What happens on long, multi step tasks as it pushes old tokens out of context? I’m not sure we know the answers to those.
There is some special sauce that they have. It’s not just a simple quant of another release. Or so they imply. I don’t have any insight into how it works or what the Bonsai special sauce is.
I’ve been using v4 Flash 0731 a lot lately and you can’t beat the price performance. That said, it sometimes takes my prompts as more of a suggestion than a directive. I’ve found that introducing a reviewer subagent (even with the same model) helps push it back to what I’ve asked for. But makes every coding session a back and forth: “do X” -> “use a reviewer subagent to analyze whether you really did X as I asked”.
How is the general knowledge of Qwen 3.6?
Do you need to explain things outside of algorithms to it?
Since the size is so small, I guess you need more explanations to it.
General knowledge helps with coding when your don't specify a lot of details and ask for big changes.
It would be a very nice model at 200-300 tps and if it was dirt cheap.
What's the limiting factor of optimizing speed and price for inference providers?
Qwen 27B full quality is FP16. So 54GB. In practice most inference providers would serve FP8, so 27GB.
DeepSeek V4 Flash in full quality is mostly FP4. ~167GB official release.
So Deepseek has 140GB model size overhead... which is shared between 100s of users single inference node serves, so not even a gigabyte of VRAM per user.
DeepSeek needs more RAM for weights, Qwen requires more compute.
Also, DeepSeek's KV cache requires less RAM than Qwen's. In concurrent situations (on servers) you load model weights once, but you have different context in each parallel session. So, it can also need less RAM than Qwen to serve, even if it's a larger model.
i think there definitely is some truth to this in terms of embeddings spaces, which is why i believe they are implemented by OpenAI/Anthropic in roughly highest import => least import bit order-- an overwhelming majority of the variance is in the first few hundred vector bits. i haven't actually tested this myself by manually truncating vectors, but it is my understanding that they generally speaking have this property.
I have an internal automated benchmark, which roughly follows my workflow, and I've been testing various models on it, local and cloud. Qwen 3.8 27B did awesome. Its understanding is correct, research is better than e.g. glm's (and I like glm), and implementation is good and careful.
Qwen 3.8 27B doesn't look benchmaxxed. These "52 AA score" numbers feel real, which is surprising. I've been using it locally for a few days for other tasks as well. If not the speed, I'd be totally happy to use it as a daily driver instead of cloud models, it is that good.
---
(benchmark, to get an idea):
1. First, initial prompt which is not super precise - similar to how I'd write a task when talking e.g. to Opus. I'm describing an idea, and asking model to come up with some plan, and also to criticize the approach. Task is about implementing a particular pi extension. I'm checking if a model actually understands what I'm asking.
2. Then, as a follow-up, I ask to research alternative implementations, research UX of similar extensions, etc. It needs to do web searches, inspect open source codebases, read articles and papers, etc. I don't prompt to do this exactly, but I expect good models to figure out they need to do it.
3. Then, implementation.
Also, one finding: Q4 and Q8 seem to have very different behavior in this benchmark. Q4 produces 2-3x thinking in the end, and makes more turns - it seems it makes more mistakes, and needs effort to recover from them, while Q8 gets more things right in a first try. In the end, quality is roughly similar, but Q8 gets there much faster, especially the implementation (tried it several times). Could be a difference between concrete artifacts, or between runtimes, I don't know, but be careful - it seems the real-world experience with qwen 3.8 27B can be vastly different, depending on how it's set up.
Regarding DeepSeek 0731 vs Qwen 3.8 27B. On this benchmark, Qwen understand my intent better, it's better at research, and I also liked its implementation more. But: if you're more precise in what you ask, 0731 is also very good, and it's quite a lot faster on mac; raw speed is better, and it needs less thinking to get there. So, I'd say it's a tie in practice, both are awesome :)
Perhaps model size and reasoning length trade off to some extent, similar to CPU vs. RAM. A smaller model with a longer reasoning trace has more intermediate structure to latch onto and build on.
3.8 actually performs slightly worse than 3.6 on AA-Omniscience Accuracy, which could imply that they traded out world knowledge for capability in other areas.
It also produces nearly twice as many tokens per task as 3.6 (and by extension, time), which may be a tradeoff required to achieve correctness at this parameter size.
Imo it makes sense for things to move in the direction of small, focused models that excel in one area. I use LLMs for technical work 99% of the time, I could care less about general world knowledge, or if the model is good at creative writing.
With good orchestration and delegation you can get surprisingly far with small models running on consumer hardware.
The biggest untapped market is pure agentic models that are built for tool calling and non hallucination instead of memorizing facts. You need some world knowledge (as in common sense) to build a useful model, but I don't think perfect recall on general QA is a good use of space when you have web search and structured knowledge in Wikidata or Wolfram Alpha.
Training should focus on tasks that require real intelligence instead of memory. Creative writing is actually good for this if you score it on coherence instead of getting random real life details right. Basic level of coding (simple prompt to code, don't need to one shot complex projects) is also great because writing a small script is more efficient than 20 separate tool calls.
Agreed. Luckily, this model also scores high in AA non-hallucination, so it knows what it doesn't know -- perfect for situations where it can just tool call a web search.
Yep, exactly. I keep saying that I want the “coding expert” extracted from these multi-T parameter models to run locally on reasonable hardware (large laptops, not servers). Yea, I know there’s no single “coding expert” that you can actually extract in these models, but you get what I mean. Like you said, when I’m coding, I don’t care about world knowledge, and I’m fine with consulting another model when I need that.
Depends on your use-case. Over the past couple days, I've found 192k context more than enough for coding. There's more thinking for sure compared to comparably sized models (running on xhigh), but I've found the results are so much better that the entire session consumes less tokens on average since weaker models need more review passes.
I'm torn on this - on the one hand performance matters, on the other so does capability.
I could run Qwen 3.6 27B on my laptop, but at 5 tok/s it was too slow even without overthinking - I never used it. OTOH, Qwen 3.6 35B A3B ran at 20 tok/s but it just could not get done what I asked of it. It sort of got close but you had to repeat and retry so much that it might have been faster to run 27B dense... maybe?
So that said, I might take a much better model that runs 2-3x slower (total time per task) but that's more capable over a faster, less capable one.
I'd also like to try a proper "plan-then-execute" type execution where thinking is entirely disabled (or low) during the execution stage but enabled/max during the planning stage.
I will definitely give 3.8 27B a better shot than 3.6 though.
Well, ackshually. E do know exactly how big glm 5.2 is. And there's more than enough data to draw conclusions about luna. Or are you one of the guys who says "big bang is just a theory"?
Interesting to see where local models are going to be in the coming days. I am already starting to believe open source models are the way to go in the coming days. With Qwen 3.8 Max, Kimi K3 etx already delivering at part perf with frontier models, the future is going to be exciting.
A lot of the benchmarks seem often near meaningless these days - really bench-maxxed to the hilt. I tend to still look at the Artificial Analysis rankings to get at least an idea on relative performance of models, is that still warranted?
What or other opinions on how representative the AA rankings are of real-world performance? Any better indicators?
Do you have any evidence that this model is bench-maxxed? I know that's particularly difficult to quantify. If there is an indicator of bench-maxxing, that just becomes the new benchmark to benchmax.
Here, filtered down for you. [0] Look at the individual benchmarks, not the combined one. You can tell that this model is much more benchmaxxed as its relative ranking swings between benchmarks is much larger. This is a hallmark.
This one is very benchmaxxed, and you can tell from this page alone. Look at the huge variance in ranking per benchmark. Most models, including at that size, are much more consistent.
It's not overthinking, it's the right amount of thinking necessary for such a small model to get good results. The dumber the model, the more it has to think to be smart. There's no easy way to reduce the thinking without reducing the model quality.
Qwen doom loops were amusing to watch the first time or two, but it's incredibly vexing to have it waffle over the same decision over and over and over and over again. I can get more done with a faster model by correcting it, and it feels better to babysit them than it does to babysit qwen to see if I need to intervene or if it will actually finish.
I do like the output from qwen when I get it, but honestly I haven't been impressed enough with it to put up with the downsides.
Qwen3.8 27B beats all medium models (40B–150B). It has the same score as DeepSeek V4 Flash 0731, which ranks #5 in large model category (> 150B).
Sources:
- https://artificialanalysis.ai/models/open-source/small
- https://artificialanalysis.ai/models/open-source/medium
- https://artificialanalysis.ai/models/open-source/large
https://simonwillison.net/2026/Aug/16/qwen-38-27b/
It seems like the token usage is 2.3x GPT Luna Max and almost 2x Kimi K3!
https://imgur.com/a/dDSyhr2
I'm curious if they can make up for this with insanely high tokens-per-second especially when served from hosted providers, though, given how tiny it is (37B!)
On the other hand, there are some of us who are stuck with hardware that has plenty of compute, but limited (V)RAM. The new 27B is just perfect for that.
No? Gemma 31B and Qwen 27B are about the same speed. Gemma 26B-A4B and Qwen 35B-A3B are about the same speed.
Output TPS in vllm for instance:
- Gemma4 26B-A4B: 200-300TPS
- Qwen3.6 35B-A3B: 120-180TPS
- Gemma4 31B: 80-120TPS
- Qwen3.6 27B: 60-80TPS
This is for a first request on a dual 5090 setup, with their respective speculative decoding methods.
It's a dense model so it will use all of its parameters per token. 37B active parameters isn't tiny at all, it's almost what Deepseek R1 had, and it's 2/3 of what Kimi k3 uses, so it's not going to be “insanely high” tps: it's going to be three times slower than Deepseek Flash (Prefil speed is going to be quite high though, but not token generation).
https://huggingface.co/bottlecapai/ThinkingCap-Qwen3.6-27B
And then a Bonsai ternary on top of that model.
...or did Prism do something special with their "bonsai" releases? I didn't notice anything like QAT being mentioned.
And I just can't fathom that the new 3.8 beats the new DeepSeek V4 Flash (which, in my eyes, is one of the best everyday coding models).
What an insane release, and convenient size to use every day/locally.
but i will test this model extensivly.
Open Router
Input /M $0.45
Output /M $3.20
Cache read /M $0.05
Throughput 27 tps
It would be a very nice model at 200-300 tps and if it was dirt cheap. What's the limiting factor of optimizing speed and price for inference providers?
More like 3-6.
Qwen 27B full quality is FP16. So 54GB. In practice most inference providers would serve FP8, so 27GB.
DeepSeek V4 Flash in full quality is mostly FP4. ~167GB official release.
So Deepseek has 140GB model size overhead... which is shared between 100s of users single inference node serves, so not even a gigabyte of VRAM per user.
Memory required for 200K of context per user:
Also, DeepSeek's KV cache requires less RAM than Qwen's. In concurrent situations (on servers) you load model weights once, but you have different context in each parallel session. So, it can also need less RAM than Qwen to serve, even if it's a larger model.
Qwen 3.8 27B doesn't look benchmaxxed. These "52 AA score" numbers feel real, which is surprising. I've been using it locally for a few days for other tasks as well. If not the speed, I'd be totally happy to use it as a daily driver instead of cloud models, it is that good.
--- (benchmark, to get an idea):
1. First, initial prompt which is not super precise - similar to how I'd write a task when talking e.g. to Opus. I'm describing an idea, and asking model to come up with some plan, and also to criticize the approach. Task is about implementing a particular pi extension. I'm checking if a model actually understands what I'm asking.
2. Then, as a follow-up, I ask to research alternative implementations, research UX of similar extensions, etc. It needs to do web searches, inspect open source codebases, read articles and papers, etc. I don't prompt to do this exactly, but I expect good models to figure out they need to do it.
3. Then, implementation.
Also, one finding: Q4 and Q8 seem to have very different behavior in this benchmark. Q4 produces 2-3x thinking in the end, and makes more turns - it seems it makes more mistakes, and needs effort to recover from them, while Q8 gets more things right in a first try. In the end, quality is roughly similar, but Q8 gets there much faster, especially the implementation (tried it several times). Could be a difference between concrete artifacts, or between runtimes, I don't know, but be careful - it seems the real-world experience with qwen 3.8 27B can be vastly different, depending on how it's set up.
Regarding DeepSeek 0731 vs Qwen 3.8 27B. On this benchmark, Qwen understand my intent better, it's better at research, and I also liked its implementation more. But: if you're more precise in what you ask, 0731 is also very good, and it's quite a lot faster on mac; raw speed is better, and it needs less thinking to get there. So, I'd say it's a tie in practice, both are awesome :)
We will see, since if true then it is likely the other makers of small, dense models will copy it and include high reasoning by default.
If that also makes the other dense open source models better, then you are probably correct.
3.8 actually performs slightly worse than 3.6 on AA-Omniscience Accuracy, which could imply that they traded out world knowledge for capability in other areas.
It also produces nearly twice as many tokens per task as 3.6 (and by extension, time), which may be a tradeoff required to achieve correctness at this parameter size.
With good orchestration and delegation you can get surprisingly far with small models running on consumer hardware.
Training should focus on tasks that require real intelligence instead of memory. Creative writing is actually good for this if you score it on coherence instead of getting random real life details right. Basic level of coding (simple prompt to code, don't need to one shot complex projects) is also great because writing a small script is more efficient than 20 separate tool calls.
Same score as the latest DeepSeek Flash 0731 which has 284B parameters! (13B active)
Its also the second best Qwen model, much better than Qwen 3.7 Max, but significantly below Qwen 3.8 Max.
I could run Qwen 3.6 27B on my laptop, but at 5 tok/s it was too slow even without overthinking - I never used it. OTOH, Qwen 3.6 35B A3B ran at 20 tok/s but it just could not get done what I asked of it. It sort of got close but you had to repeat and retry so much that it might have been faster to run 27B dense... maybe?
So that said, I might take a much better model that runs 2-3x slower (total time per task) but that's more capable over a faster, less capable one.
I'd also like to try a proper "plan-then-execute" type execution where thinking is entirely disabled (or low) during the execution stage but enabled/max during the planning stage.
I will definitely give 3.8 27B a better shot than 3.6 though.
What or other opinions on how representative the AA rankings are of real-world performance? Any better indicators?
[0] https://artificialanalysis.ai/models/qwen3-8-27b?models=deep...
https://benchlm.ai/models/qwen3-5-27b#ledger
I do like the output from qwen when I get it, but honestly I haven't been impressed enough with it to put up with the downsides.