GPT 5.3 Codex vs GLM 5.2
OpenAI's most advanced agentic coding model with 400K context.
Z.ai's frontier reasoning model for long-context agents and software engineering.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 5.3 Codex vs GLM 5.2▼
Which is better, GPT 5.3 Codex or GLM 5.2?
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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, GPT 5.3 Codex or GLM 5.2?
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GLM 5.2 has a lower blended cost. GPT 5.3 Codex: $1.75 input / $14.00 output. GLM 5.2: $1.40 input / $4.40 output.
Which has a larger context window, GPT 5.3 Codex or GLM 5.2?
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GPT 5.3 Codex has a larger context window: GPT 5.3 Codex supports 400K tokens vs GLM 5.2 at 262K tokens.
Do both GPT 5.3 Codex and GLM 5.2 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, GPT 5.3 Codex or GLM 5.2?
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GLM 5.2 scores higher on SWE-bench Verified: GPT 5.3 Codex resolves 75% vs GLM 5.2 at 79%.
What are the key differences between GPT 5.3 Codex and GLM 5.2?
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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 GPT 5.3 Codex and GLM 5.2 for free on idapt.app to see which performs better for your specific needs.