GLM 5.2 vs GPT 5.3 Codex
Z.ai's frontier reasoning model for long-context agents and software engineering.
OpenAI's most advanced agentic coding model with 400K context.
No captured outputs for these models yet.
Frequently Asked Questions: GLM 5.2 vs GPT 5.3 Codex▼
Which is better, GLM 5.2 or GPT 5.3 Codex?
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Based on the Capability Index, GPT 5.3 Codex scores higher (87.0 vs 83.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, GLM 5.2 or GPT 5.3 Codex?
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GLM 5.2 has a lower blended cost. GLM 5.2: $1.40 input / $4.40 output. GPT 5.3 Codex: $1.75 input / $14.00 output.
Which has a larger context window, GLM 5.2 or GPT 5.3 Codex?
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GPT 5.3 Codex has a larger context window: GLM 5.2 supports 262K tokens vs GPT 5.3 Codex at 400K tokens.
Do both GLM 5.2 and GPT 5.3 Codex support vision?
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GPT 5.3 Codex supports vision/image input, but GLM 5.2 does not.
Which has better coding performance, GLM 5.2 or GPT 5.3 Codex?
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GLM 5.2 scores higher on SWE-bench Verified: GLM 5.2 resolves 79% vs GPT 5.3 Codex at 75%.
What are the key differences between GLM 5.2 and GPT 5.3 Codex?
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Key differences: only GPT 5.3 Codex supports vision input. Compare full specs on this page.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GLM 5.2 and GPT 5.3 Codex for free on idapt.app to see which performs better for your specific needs.