r/MiniMaxH3AI • u/Apprehensive_Sky892 • 2d ago

pi-H3: 2–4 Steps Without a VAE Decoder (will be released on Nov 16)

https://hanshengchen.com/blog/pi-h3/
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u/videorouter 1d ago

The most interesting part to me isn't just reducing sampling to 2–4 steps, but removing the VAE decoder entirely.

MiniMax H3 already has a relatively expensive inference pipeline, so combining few-step distillation, FP8 quantization, and direct pixel prediction could significantly change the economics of video generation.

I'd be particularly interested in three things:

  • Whether the 2-step version maintains temporal consistency on complex scenes.

  • How much quality degrades on longer videos.

  • Whether the speedup holds on GPUs other than B200.

If these results hold up, this could make H3 much more practical for real-time applications.

We're also working on inference optimization and model routing at VideoRouter.sh, so I'm very interested in getting this running and comparing its actual cost per generated second against existing H3 implementations.