Qwen3.8-Flash-Next MTP draft head (Q8_0, ROCm-verified)

Standalone NextN/MTP draft sidecar for Qwen/Qwen3.8-Flash-Next, for use with llama.cpp --spec-type draft-mtp (-md flag).

Full guide, measurements and pitfalls: https://github.com/drluoto/flash-next-strix-halo ยท Discussion: https://github.com/ggml-org/llama.cpp/discussions/27950

Provenance

Converted directly from the official checkpoint with the --mtp export from llama.cpp PR #27836 plus the whitelist fix (rmonsurate/llama.cpp#1) that keeps the model-level output_hc_norm/_down/_up mixer the loader requires. 37 tensors: the 4B MTP head, shared embeddings/lm_head/norm, and the head mixer.

Only the MTP-relevant tensors (5.2 GB of the 360 GB checkpoint) were fetched, via HTTP range reads on the safetensors shards.

sha256(mtp-egen-Q8_0.gguf) = b9880220df29fc224bbce408c867cd5d9c021263b754033ea624b669e374f4ec

Requirements

Loading a detached head needs crusaderky's loader fix on top of PR #27836. A pre-assembled branch (that + hipCUB TOP_K from #26592): drluoto/llama.cpp branch strix-halo-flash-next.

Measured (Ryzen AI Max+ 395 / Radeon 8060S, ROCm 7.1, target UD-IQ4_XS, greedy)

workload no spec draft-mtp,ngram-mod + GPU TOP_K
file rewrite @8k ctx 16.8 t/s 47.1 t/s
new code @8k 16.8 31.7
file rewrite @24k ~15 28.6
new code @24k ~15 25.4

Greedy output verified clean at long prompts (the failure mode of earlier community MTP ports was prompt-length-dependent corruption above ~1k tokens).

llama-server -m Qwen3.8-Flash-Next-UD-IQ4_XS-00001-of-00003.gguf \
  -md mtp-Qwen3.8-Flash-Next-Q8_0.gguf \
  --spec-type draft-mtp,ngram-mod --spec-draft-n-max 3 \
  --spec-ngram-mod-n-max 64 --spec-ngram-mod-n-match 24 \
  -lm dio -fa 1 -c 262144 --jinja
# on ROCm < 7.13 add: GGML_CUDA_DISABLE_GRAPHS=1 (rocPRIM capture guard, see #26592)
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