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I've had GLM 5.3 write CUDA kernels via OpenCode for a thing I'm going to intentionally be vague about and... wow am I impressed. Not that I don't want to understand for myself the code it's writing, but it's correct *and* performant.

Correct and fast is a big deal for kernels. Having it write a plain PyTorch reference first and testing the kernel against it is a cheap way to keep trusting the output.