GLM-5.3 matches frontier coding benchmarks with ~750B params

Z.ai's GLM-5.3, same base as GLM-5.2 with extended post-training, surpasses Kimi K3 on many benchmarks and Claude Fable 5 or GPT-5.6-Sol on some. Available in coding plan, API soon, open weights on Hugging Face in two weeks.
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