In-situ parity against the bf16 model (VLLM_OMNI_PREDICTOR_PARITY_CHECK=1):
fp32 control keeps 93.8 % top-1 / 95 % top-5 / KL 0.0015; torch.ao dynamic
int8 falls to 22 % top-1 (max logit diff 7), so per-tensor activation
quantization is not acceptable as a default. Adds the ao-nohead variant
(int8 transformer body, fp32 lm heads) for measurement.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>