GLM 5.3
FrontierClosedZ.ai
Z.ai's 2026-08-14 Coding Plan flagship — same base as GLM 5.2, with the documented gains from post-training only. Direct token API and open weights are not published yet.
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Best for: GLM Coding Plan agent work · Long-horizon coding in Claude Code / OpenCode / Cline · Teams already on Z.ai subscriptions
Watch out: Thinking cannot be disabled (`thinking.type: disabled` fails); `reasoning_effort` is low / high / max (default max). Open weights are promised about two weeks after launch pending safety review — not a downloadable checkpoint today. Vendor DeepSWE v1.1 66.9 used mini-swe-agent at 400K context, not the public Datacurve v1.1 board (snapshot generated 2026-08-13, before this launch).
- Released
- August 14, 2026
- Input / 1M
- Not verified
- Output / 1M
- Not verified
- Context
- 1M
- Max output
- 128K