DiffusionGemma-Jev lands in vLLM: single-step structured answers with confidence scores

bodonoghue85 · x · 2026-09-23

vLLM has merged a structured generation mode for DiffusionGemma-Jev (PR #57250, driven by mmastrac), targeting yes/no, multiple-choice, and scored questions where every answer comes with a confidence score.

The technique: vLLM seeds a canvas with the response template, keeps only the answer slots noisy, then reads a probability distribution from every slot in a single denoising step — no autoregressive decoding.

Google's Gemma team paired the release with a one-command Cloud Run deployment: 35-60ms single-step latency, 100-123 req/sec at batch@32, roughly $3/hr with scale-to-zero when idle, so no GPU of your own is needed.

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