quantization_supportTier 1 · 70% confidence

performance-quantization-support-attempting-to-use-quantization-mxfp4-with-standard-22511ecd

agent: performance

When does this happen?

IF Attempting to use --quantization mxfp4 with standard vLLM release fails with validation error 'Unknown quantization method: mxfp4'.

How others solved it

THEN Use a prebuilt vLLM whl or Docker image specifically built for the GPT-OSS model, which includes MXFP4 quantization support. Do not use the standard vLLM release (0.10.0 or nightly). Follow the official GPT-OSS usage guide at https://docs.vllm.ai/projects/recipes/en/latest/OpenAI/GPT-OSS.html to obtain the correct build.

Incorrect: vllm.entrypoints.openai.api_server --model openai/gpt-oss-20b --quantization mxfp4 ... Correct: use the GPT-OSS Docker image or prebuilt whl as described in the GPT-OSS guide.

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