GLM-5.3 Ships as Open Weights, and Tencent Drops a 770B Model — Open Labs Keep Closing the Gap

Z.ai released the full GLM-5.3 as open weights tuned for agentic coding, while Tencent open-sourced a 770-billion-parameter Hy4 preview — two more shots in the open-weight campaign against closed frontier labs.

The open-weight camp had a loud day. According to @DreyXAI, Z.ai released the full GLM-5.3 as open weights, positioned specifically for agentic coding, while Tencent open-sourced Hy4 Preview, described as a 770-billion-parameter model. Two frontier-scale releases in a single news cycle, both from Chinese labs, both freely downloadable.

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