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Cataloged from AxionML/Qwen3.5-397B-A17B-NVFP4
All models by AxionML →Mirrored by AxionML for open-source serving and deployment use cases. Part of AxionML's effort to provide ready-to-serve quantized models for the community.
Quantized by NVIDIA. The weights in this repository are an unmodified copy of nvidia/Qwen3.5-397B-A17B-NVFP4-V2 (revision
8f590eae8f10bf55d9a46f79ea0280bde435c9f8). All credit for the quantization belongs to NVIDIA.
This is an NVFP4-quantized version of Qwen/Qwen3.5-397B-A17B (397B total parameters, 17B activated), quantized with NVIDIA Model Optimizer.
About NVFP4 quantization: NVFP4 on Blackwell couples a compact E2M1 FP4 codebook with blockwise FP8 (E4M3) scaling over 16-element micro-blocks, so that 4-bit stored values remain numerically useful for neural-network computation. The E2M1 codebook provides a small, nonuniform set of representable magnitudes up to ±6 and relies on saturating behavior rather than IEEE NaN/Inf encodings to maximize usable range per bit. Using an FP8 block scale (rather than power-of-two-only E8M0) enables fractional scales and error-minimizing scale selection. On Blackwell Tensor Cores, native FP4 multipliers exploit E2M1 simplicity while higher-precision FP32 accumulation protects dot-product accuracy.
Ready for commercial and non-commercial use under Apache 2.0.
Scores reported by NVIDIA for this checkpoint. Baseline: Qwen/Qwen3.5-397B-A17B-FP8.
temperature=0.6,top_p=0.95, max 64,000 tokens (128,000 for τ²-Bench Telecom).
nvidia/Qwen3.5-397B-A17B-NVFP4, Feb 2026) quantized only the routed experts with max calibration and left attention and shared experts in BF16 (~251 GB). V2 adds MSE scale search and FP8 attention/shared experts — smaller and faster, and within noise of Qwen's FP8 checkpoint.Validated upstream with lmsysorg/sglang:v0.5.12.post1-cu130 on B300. Tip: add --mamba-ssm-dtype bfloat16 to keep the Mamba SSM state in BF16 for faster decode on Blackwell.
The base model was trained on data that may contain toxic language and societal biases. The quantized model inherits these limitations. It may generate inaccurate, biased, or offensive content. Please refer to the original model card and the upstream quantized model card for full details.
python3 -m sglang.launch_server \ --model-path AxionML/Qwen3.5-397B-A17B-NVFP4 \ --tensor-parallel-size 4 \ --quantization modelopt_mixed \ --disable-radix-cache \ --trust-remote-code