Salvatore Sanfilippo — antirez, the guy who wrote Redis — shipped h3.c on August 10: a from-scratch inference engine in C and Metal that runs MiniMax’s H3 video model natively on Apple Silicon. MIT licensed. 381 points on Hacker News.
What it actually does
No cloud API, no Python stack. It’s a local CLI and library. Prompt-to-video and prompt-to-audio work end to end, plus first/last-frame conditioning and ordered Ref2VA references for images, video, and audio. He’s still grinding on H3-specific Metal performance and memory tuning across M3 Max and M5 Max.
H3 is the model underneath: omni-modal, 2K at 24fps, clips up to 15 seconds, native stereo audio generated in the same pass. Quantized to 4-bit it fits in 8GB of VRAM.
Why this matters
MiniMax’s own account said it best: open weights mean anyone can bring H3 to any hardware, and sometimes “anyone” is the creator of Redis. You can’t hire that. One person, one weekend-scale repo, and a Chinese video model lands on Macs — that’s the whole argument for shipping weights instead of an API.
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