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Qwen 3.8 27B

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Re: Qwen 3.8 27B

#651
Thank you Qwen team for this release.

Compared to closed weight (especially unreleased and access-limited) and open weight/source large sparse MoE LLMs/VLMs, open weight/source small dense models benefits public the most because they just reaches more people.

Compared to Qwen 3.6, 3.8's thinking style changed drastically. With xhigh budget, it thinks a lot MORE, and longer thinking session directly translates to better performance. This tradeoff between performance and computation, memory, etc. is meaningful to me.

However, because Qwen 3.6 and 3.8 share the same architecture, with 32GB vram, llama.cpp, IQ4_XS model, MTP and FP16 mmproj, I can only get 200k context, which is not good compared to 640k context of muse glimmer. Hopefully this problem will be solved in Qwen 4.0 release.

Re: Qwen 3.8 27B

#653

Earlier quoted context omitted.

> Qwen 3.8 27B is only the second local model after Gemma 4 that managed to correctly reason through one of my private benchmarks. I don't expect you to blab publicly about your private benchmark, but what sorts of reasoning does it require?

It writes turing complete Beauty and the Beast fanfic.

I laughed so hard at that, thanks

Re: Qwen 3.8 27B

#654
post #518

Credit where it's due. Qwen 3.8 27B is only the second local model after Gemma 4 that managed to correctly reason through one of my private benchmarks. It took 5x as many tokens to do it and 12m30s with MTP enabled, but it did do it. Gemma 4 reasoned through it more implicitly, while Qwen 3.8 reasoned more explicitly. Laguna and Muse Glimmer failed hard on it, though they're useful for other tasks. The VRAM usage see…

Qwen’s 3.6/3.8 27b actually has some algorithmic advantage when it comes to the kv cache size needed, so it actually needs less memory at equivalent context. My experience using both in vllm supports, with considerably more overhead in context size on these models than Gemma 4 31b, and better performance in most tasks I’ve tried on both models.

Re: Qwen 3.8 27B

#655
post #646

Earlier quoted context omitted.

I think a specialized model could squeeze all you need to know about a certain profession in 30GB. But not all professions at once, which is what these models try to do. Or maybe not, maybe there's a world model needed for human level at any profession that is very hard to quantify and requires more than 30GB by itself.

Yea to be clear I think >70% of the information is not profession specific. I just think about all the content I’ve consumed in my life to become a professional software developer and I would be very surprised if it couldn’t be adequately represented by The “foundational overlap” of K-12 education is identical for most professions with 2-8 years of “finishing” on top. My mental model is that the budget is spread acro…

The human genome is 800MB, (and 500MB with compression according to GPT) so that part is easy.

I think the problem is that the conversation drifted from "all useful human knowledge" to "enough knowledge to do my job".

Both a human and a current large model will bring up unprompted some tax regulation that applies in your district that could matter to your task. A small model won't know the tax code of every city in the world, as it's probably impossible to fit, and it's the kind of thing that unless you already know about, it's very hard to search for, let alone come up with unless specifically prompted about something tax related.

Unless we start having different small models trained for a certain profession for a certain city, I think we'll need those trillion parameters.

Re: Qwen 3.8 27B

#656
post #518

Credit where it's due. Qwen 3.8 27B is only the second local model after Gemma 4 that managed to correctly reason through one of my private benchmarks. It took 5x as many tokens to do it and 12m30s with MTP enabled, but it did do it. Gemma 4 reasoned through it more implicitly, while Qwen 3.8 reasoned more explicitly. Laguna and Muse Glimmer failed hard on it, though they're useful for other tasks. The VRAM usage see…

> correctly reason through one of my private benchmarks

Want to say more about these private benchmarks? :)

Re: Qwen 3.8 27B

#657
post #518

Credit where it's due. Qwen 3.8 27B is only the second local model after Gemma 4 that managed to correctly reason through one of my private benchmarks. It took 5x as many tokens to do it and 12m30s with MTP enabled, but it did do it. Gemma 4 reasoned through it more implicitly, while Qwen 3.8 reasoned more explicitly. Laguna and Muse Glimmer failed hard on it, though they're useful for other tasks. The VRAM usage see…

> Qwen 3.8 27B is only the second local model after Gemma 4 that managed to correctly reason through one of my private benchmarks. I don't expect you to blab publicly about your private benchmark, but what sorts of reasoning does it require?

Well, I will say:

#1: it does not require deep world knowledge, because that's not what local models are for.

#2: it directly attacks drive-by understanding, overly linear processing training, poor attention mechanisms, poor reasoning patterns or lazy assumptions that ignore very easy low hanging fruit.

#3: it requires solid instruction following in the face of errors. a lot of models will run into errors and then fall back into some kind of error recovery process that bypasses instruction following.

#4: does not require prompt fine tuning to tweak to each individual model. they all seem to understand.

#5: not unfair. almost every model demonstrates in their reasoning that they have the necessary information that if reasoned about appropriately, could arrive at the correct answer.

#6: not designed to add unnecessary complication that it is intended to exhaust reasoning budgets of any sort, so it is not inherently unfair to models that reason a little more or less. for example, it does not require unnecessary reasoning soaks (ie: hiding the prompt inside base-64 encoding)

#7: has real world use and is probably applicable to overall ability to generalize.

#8: can be scaled up as models get better.

#9: is a very good indicator of how bad a model is falling apart under various inference settings.

Re: Qwen 3.8 27B

#658
post #419

Absolutely the best pelican I've seen from a model that runs on my laptop: https://tools.simonwillison.net/markdown-svg-renderer#url=ht... Bicycle is the right shape. Pelican beak is excellent. Nice background. Most importantly, the pelican has one leg on each side of the bicycle - that's very rare. (No chain on this bicycle though - in the reasoning trace it says "already chainstay... skip chain detail; maybe a smal…

Have you thought about running a second tier of the Pelican benchmark where you see which model makes best pelican on lowest or no reasoning settings? I think that'd be pretty interesting and might help highlight which models have a baseline capability - even within those I'd imagine the token usage would vary wildly and might give some indications on verbosity as well.

Re: Qwen 3.8 27B

#659
post #82

One thing a lot of people don't seem to factor when hyping Qwen is how much models like this tend to 'overthink' with seemingly endless 'second guessing'. 3.8 seems no different from what I've tried thus far. As capable as it is, it's hard to justify using it when a competing model (e.g. Gemma4:26b-a3b) can consistently achieve the same or similar response with only 1/10th as many 'thinking' tokens, achieve much high…

IME this is a strong/reliable model smell, you typically see smarter and less benchmaxxed models' thinking traces spending more time exploring the solution space, and benchmaxxed models more time trying to refine/decide on the response contents. It has always been a big problem with qwen.

In general it's kind of a benchmaxxing/distillation (I don't mean that pejoratively here, read on) artifact where test time compute's purpose is to refine/zero-in on a particular input:output pair. Basically they're trying to "remember"/re-derive the answer rather than arrive at it deductively - it gets comical/absurd when you see it expending a huge amount of tokens trying to figure out the answer to some trivial question or response to some input, as if it were a trick question or the choice of wording was of the utmost importance. But it's not a bad thing when the output matters or the task is hard: basically the model has been trained to respond/act like a much smarter model and it's probably better for it to overgeneralize that behavior.

Also, IME Gemma and most other local models that support thinking tend to have the same problem, and it's partly only a "problem" because they give you access to the thinking tokens themselves (which you don't in many cases see when working with frontier american models) and you can actually see how they're getting spent. For the local or bulk (runnin on owned or rented hardware) use case where you are paying in time/watts rather than purely by the token, IMO it's a good idea to just look at the task success rate / time per task and not worry about the raw thinking token count.

Re: Qwen 3.8 27B

#660
post #412

Image->html test for this. Original images: https://image.non.io/neonRamenDesigns.webp Qwen 3.8 build: https://html.non.io/neonRamenQwen3.8-27b Overall I'm very impressed with how well this did. It's a big improvement over 3.6, and it feels on-par with some much, much larger models. I think this one is on-par with Gemini 3.7 Flash. One thing to note - the build for this on my RTX 6000 pro blackwell took a long time.…

harness setup? how much vram ? how are you handling a 2hr long build ? multiple sessions? fan out sessions (subagents)?
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