MiniMax-H3 open-weights video model gains RTX 4090 speedup

MiniMax-H3 reaches 4.44× end-to-end speedup on RTX 4090 with an optimized SM89 CuTe DSL kernel in Sol-Attn. The open-weights model supports text-to-video, image-to-video, and reference-to-video with synchronized soundtrack.
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