antirez wrote a MiniMax H3 inference engine in C for Apple Silicon and took 898 stars in two days.

h3.c, published August 9 by the Redis creator, targets M3/M5 Max Macs from scratch. Reported: 512×512, 22-frame, 20-step generation at ~16.69s on M5 Max, dropping to ~12.60s with token reduction, 8.02s for a native 256-square preview, 19.32s on the int8 path. Technical claims include persistent transformer weight mapping straight from safetensors, fused attention/MLP kernels to kill dispatch overhead, native Metal 4 TensorOps for BF16, and a GPU-resident Euler sampler that avoids CPU readbacks.