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GLM-5.3
GLM-5.3 is a Z.ai flagship model described as having a 1M-token context window, 128K maximum output, and native tool calling and structured output, and is served on Vercel AI Gateway at zai/glm-5.3 without a separate Z.ai API key.
What changed
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Current state
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supported
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Disputed / Watching
Supports
On DeepSWE v1.1, a benchmark for fixing real GitHub issues end-to-end, open rival Kimi K3 (67.5) and Fable 5 (69.7) both beat GLM-5.3's 66.9.
Disputes
Zhipu said GLM-5.3 ranked as the strongest open-source model across several mainstream benchmarks, with its coding and agent capabilities approaching those of…
Supports
Zhipu said GLM-5.3 ranked as the strongest open-source model across several mainstream benchmarks, with its coding and agent capabilities approaching those of…
Disputes
On DeepSWE v1.1, a benchmark for fixing real GitHub issues end-to-end, open rival Kimi K3 (67.5) and Fable 5 (69.7) both beat GLM-5.3's 66.9.
Supports
Always reasons; thinking cannot be disabled.
Disputes
GLM-5.3 is Z.ai's flagship model with a 1M-token context window, 128K max output, native tool calling, and structured output.
Timeline
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China's Z.ai says new model nears Anthropic's Mythos 5 in cyber-defence tests | Reuters
GLM-5.3: Frontier Coding with Emergent Cyber Capabilities
glm-5-2-free-for-eve-agents-through-august-27-via-blackbox-on-ai-gateway
GLM-5.3 Review: Z.ai's Open-Weight Coding Model Beats the Frontier - AICC - AI.cc
An industrial-scale distillation of models, or subtle benchmaxxing: What developers really think of GLM-5.3 - The New Stack