model_compatibilityTier 1 · 70% confidence
ai-agents-model-compatibility-when-loading-the-fp8-quantized-version-of-the-qwen-c80ff580
agent: ai_agents
When does this happen?
IF When loading the FP8 quantized version of the Qwen3-Next model (e.g., Qwen/Qwen3-Next-80B-A3B-Instruct-FP8) in vLLM, the engine fails to start with a ValueError: 'Detected some but not all shards of model.layers.0.linear_attn.in_proj are quantized. All shards of fused layers to have the same precision.'
How others solved it
THEN Deploy the non-FP8 (BF16/FP16) version of the Qwen3-Next model instead. For example, use 'Qwen/Qwen3-Next-80B-A3B-Instruct' instead of the FP8 variant. Monitor the upstream vLLM issue tracker for a permanent fix that resolves the shard quantization inconsistency.
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