Qwen3.8-Flash-Next GGUF for Lucebox

The Qwen3.8-Flash-Next files Lucebox serves: the UD-Q4_K_XL quantization and the multi-token-prediction (MTP) drafter used for speculative decoding. They are byte-identical copies of unsloth/Qwen3.8-Flash-Next-GGUF at revision 766911a6b7369840a91dbcd95f9f997acaab6cd6, kept here so Lucebox installs download from one place.

Files

File Size (bytes) sha256
UD-Q4_K_XL/Qwen3.8-Flash-Next-UD-Q4_K_XL-00001-of-00004.gguf 10,946,624 4448186216b3af4cc558bbce2c3213f01608f8f8b2e5267a9767971dd3ec8082
UD-Q4_K_XL/Qwen3.8-Flash-Next-UD-Q4_K_XL-00002-of-00004.gguf 49,859,583,136 3f342f1c1580473f1ee94ddd5b28206e8c07a70fa1a366f59d1d6c922919a6c9
UD-Q4_K_XL/Qwen3.8-Flash-Next-UD-Q4_K_XL-00003-of-00004.gguf 49,376,141,504 56758f40269cad5cd9b0d3d6fbae0f40f6d5be6de49e4ab392dbe83157d9cbd3
UD-Q4_K_XL/Qwen3.8-Flash-Next-UD-Q4_K_XL-00004-of-00004.gguf 12,087,983,520 753bda48b98ba4f1636134a90a967de1b2d3908a236c026e464777342e53510a
MTP/mtp-Qwen3.8-Flash-Next-shared-Q8_0.gguf 2,786,568,256 5ff54097406a905cf3a724c709124ceb0e3e10235ee862298969e91c96fa96e6

Performance on Lucebox

Measured with the Lucebox engine: UD-Q4_K_XL, greedy decoding with the MTP drafter, 131K context.

Strix Halo iGPU Strix Halo + Radeon AI PRO R9700
Decode, short reply 40 tok/s 75 tok/s
Decode after a 16K prompt 24-28 tok/s 44-45 tok/s
Prefill, 16K prompt 1,300 tok/s 1,820 tok/s
Same 16K prompt sent again 2.7 s instead of 10.6 s (prefix cache)

On the two-GPU box the R9700 keeps the dense weights, the KV cache, the drafter and the most-used experts, and the Strix Halo runs the other experts. Speculative decoding does not change the output: greedy text is identical with the drafter on or off.

Use with the Lucebox engine

Point luce_server at the first shard; the other shards load from the same folder, and the engine finds the drafter in MTP/ on its own. --draft PATH picks a drafter explicitly and --verify-width 1 turns speculative decoding off.

luce_server UD-Q4_K_XL/Qwen3.8-Flash-Next-UD-Q4_K_XL-00001-of-00004.gguf

License

Qwen community license 1.0; the full text is in LICENSE and applies to every file here.

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