h3-metal

Native MiniMax-H3 inference for Apple Silicon. The project is being built as a sequence of working vertical slices: deterministic host/model metadata first, then portable Metal block parity, prompt encoding, prompt-to-video/audio, and first/last-frame conditioning and then ordered references.

Prompt-to-video/audio, first/last-frame conditioning, and ordered Ref2VA image/video/audio references work end to end. The current work is incremental H3-specific Metal performance and memory optimization on M3 Max and M5 Max.

Tutorial

1. Build and inspect the model

The examples assume that the Hugging Face snapshot is in ./MiniMax-H3 and that FFmpeg and FFprobe are available on PATH .

make -j8 mkdir -p outputs ./h3 --info -d ./MiniMax-H3

--info checks the model layout and prints the selected Metal device without mapping all weights or generating media.…