Minimax H3 fast i2v tested: 8 steps at 3.20s/it, workflow and prompts shared

Time-Ad-7720 · reddit · 2026-09-19

A Redditor tested the Minimax H3 fast i2v model (fastvideofasth38stepv2prunedint8convrot) locally, hitting 3.20s/it at 8 sampling steps, and published a downloadable workflow.

The demo composes three 3-second POV shots into a matchcut sequence, with full prompts included. Key techniques: start/end frame constraints for precise motion control, explicit bans on pauses/camera moves/cuts for continuity, specified audio cues, and style/label/HUD consistency instructions. The background song was a human+AI hybrid production.

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