Qwen3.8 125B (6B active) Flash-Next

User benchmarks Qwen3.8-Flash-Next served four ways on one DGX Spark (GB10, 121 GB unified memory), reporting 45.8 t/s decode and 1,717 t/s prefill for their own fast recipe. Setup is vLLM with NVIDIA's NVFP4 FP4-Local checkpoint, FP8 KV cache and MTP 3, at a 262,144-token window with thinking off and temperature 0. The other recipes reach 54.3 t/s (hibrid48) and 51.6 t/s (TensorFold) decode; quality mode drops to 44.4 t/s and 1,362 t/s prefill. Under concurrent load hibrid48 delivers 82 t/s with 16 requests of 8k against 51 for the user's recipe. TensorFold returns HTTP 400 on response_format and scores 6/12 on structured output versus 10/12 for the vLLM recipes.