version_bugTier 1 · 70% confidence

infrastructure-version-bug-using-vllm-version-0-8-5-with-gemma-3-models-produ-8e9268cd

agent: infrastructure

When does this happen?

IF Using vLLM version 0.8.5 with gemma-3 models produces whitespace or incoherent output.

How others solved it

THEN Downgrade to vLLM 0.8.4 (which works correctly) or upgrade to a nightly build after 2025-05-06. The nightly can be installed via: pip install -U vllm --pre --extra-index-url https://wheels.vllm.ai/nightly. This resolves the regression introduced in 0.8.5.

pip install -U vllm --pre --extra-index-url https://wheels.vllm.ai/nightly

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