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Qwen3.8-Flash-Next

qwen.ai

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Re: Qwen3.8-Flash-Next

#162

In initial testing on Ryzen 395 / Strix Halo it's about 22 tokens/s generation and the output quality is impressive. Better and faster than 3.8 27B, and enough better to justify moving away from 3.6 35B even though 35B is still faster. The Unsloth weights don't come with vision support but you can add that back yourself. llama.cpp recipe in case anyone else wants to save some time on setup: https://pastebin.com/fcqsb…

> Better... than 3.8 27B How can a "6b active per token" MoE be better than a just released 27b in the same family? Possible maybe, but quite interesting and requiring some explanation. Edit: ok, on second thought, probably because the small "experts" are really rich in specialized training compared to the dense model. Still raising questions about the details, e.g. the reasoning abilities (or all meta-skills) of a "…

Separating knowledge from reasoning so you only pay for what you use is a big rationale for MoE, the big problem being MoE training has historically been hard to get right. In a dense model every single token you're paying a cost to determine whether you're now talking about the flavor of durian.

Re: Qwen3.8-Flash-Next

#163

Earlier quoted context omitted.

I find LLMisms very annoying to read, it’s almost like they are bullet points in the shape of a paragraph. It feels very “skippy” to me. EDITED: Removed a question that I couldn’t make feel suitably polite.

I quite agree. Any sufficiently self-stereotypical format for prose is grating to me after enough time reading or listening to it. Humans are best engaged by mixing up the length, style, and tone of their sentences, in my experience. LLMs do the opposite of that and it makes their output an irritating slog to read through in full. I can't help but wonder if this is on purpose (or an inevitable evolutionary feature as…

Speaking speculatively, humans love percussion. I’d bet that like how many songs have a drum beat, these sequences of short punctuating sentences are common constructs in lots of prose and therefore over represented.

Re: Qwen3.8-Flash-Next

#164

In initial testing on Ryzen 395 / Strix Halo it's about 22 tokens/s generation and the output quality is impressive. Better and faster than 3.8 27B, and enough better to justify moving away from 3.6 35B even though 35B is still faster. The Unsloth weights don't come with vision support but you can add that back yourself. llama.cpp recipe in case anyone else wants to save some time on setup: https://pastebin.com/fcqsb…

We should still expect significant performance improvements. I believe Unsloth’s branch (and ggml’s) don’t support MTP or the ngram embedding yet.

The active param count is so small I'm not sure how much advantage MTP will have, the current llama.cpp does load the ngram embeddings but I haven't verified it uses them. I expect to redeploy all this stuff every few days as the tooling gets improved.

Re: Qwen3.8-Flash-Next

#165
post #76
post #67

Earlier quoted context omitted.

Gonna have to wait a few days to see what the wizards of the HF community come up with…

They are already working on it. https://huggingface.co/unsloth/Qwen3.8-Flash-Next-GGUF https://unsloth.ai/docs/models/qwen3.8-next > You will need at least 75 GB of RAM or unified memory to run the model. Its smallest 1-bit quantized version is larger than usual because of the model’s architecture so 1-bit isn't really 1-bit at all. However, this also means the quantization is less aggressive, allowing the model to r…

The PR branch does seem to work, I'm planning to move almost all of my Qwen using workload over to it tonight.

Re: Qwen3.8-Flash-Next

#166

FYI: nothing seems to be able to run this (easily) yet. llama.cpp, vllm etc I couldn't get working because of no support in the mainline version.

Relevant PR: https://github.com/ggml-org/llama.cpp/pull/27742

This branch works now: https://github.com/unslothai/llama.cpp/tree/qwen4exp/qwen3.8...

  cmake -B build -DGGML_CUDA=ON
or

  cmake -B build -DGGML_METAL=ON
then

  cmake --build build --config Release -j --target llama-server llama-cli

Re: Qwen3.8-Flash-Next

#167
post #53

Earlier quoted context omitted.

You’re absolutely right to be hopeful. Three honest possibilities, and I’ll be straight with you about each: 1. It overthinks — Just like the previous iteration. High confidence. 2. It doesn’t overthink — Improvement from the last model for your use case. Regression for others. 3. It sometimes overthinks — Best case all around. A feature, not an impairment. One final thing worth mentioning: (I made myself irrationall…

> You’re absolutely right to be hopeful. Three honest possibilities, and I’ll be straight with you about each: > [UGC styled humorously as LLMisms] All joking aside, having interacted with Claude intensely for the last 8 months and about 30 hours/week in the last 3, I’ve started to notice how (for want of a better word) “readable” (“digestible” ? “comprehensible” ? “Predictable” is the wrong direction.) information c…

I suppose it makes sense that "LLMglish" becomes more intelligible with familiarity. That is after all how it works with other dialects or contexts with a lot of jargon.

Re: Qwen3.8-Flash-Next

#168
post #108

Earlier quoted context omitted.

World knowledge also means knowing the various algorithms and ways particular programming problems are solved. You can't search what you don't even know exists.

>You can't search what you don't even know exists. that's not really entirely true -- one can google for "fast pathfinding' and stumble upon A-star , all that had to be queried was the intent/desire. a lot of smaller agentic models and a lot of harnesses live on that premise.

Path finding is a very closed and well defined problem.

Re: Qwen3.8-Flash-Next

#169
post #156

For the impatient, I merged llama.cpp tentative branches to get it running here https://github.com/alainnothere/llama.cpp/tree/disk-cache-ev... , thing runs at 23.54 token/sec and my setup runs at high 30 the 3.8 dense 27B. and this is the pelican from the iq4_xs model https://github.com/alainnothere/llama.cpp/blob/disk-cache-ev...

If you've got a DGX Spark try my little engine: https://github.com/rdaum/eider/

NVFP4 quant

Re: Qwen3.8-Flash-Next

#170

Earlier quoted context omitted.

We should still expect significant performance improvements. I believe Unsloth’s branch (and ggml’s) don’t support MTP or the ngram embedding yet.

The active param count is so small I'm not sure how much advantage MTP will have, the current llama.cpp does load the ngram embeddings but I haven't verified it uses them. I expect to redeploy all this stuff every few days as the tooling gets improved.

My initial implementation of MTP I have here in my own (DGX Spark specific) custom runtime brought it up from ~12 tok/sec without MTP to ~16 to ~20 with; depending on workload.

It's not world changing, but at those speeds I'll take anything I can get.

(The ngram embeddings in this case are paged to/from disk which seems to cost ... basically nothing).

https://github.com/rdaum/eider/

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