GPT-5 Codex delivers the flagship GPT-5 experience through the dedicated Codex API surface, supporting the same multimodal capabilities with a specialized routing endpoint.
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Performance (7-day Average)
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GPT-5.2-Codex is an upgraded version of GPT-5.2 optimized for long-horizon, agentic coding tasks in Codex or similar environments. It's available in the Responses API only and supports low, medium, high, and xhigh reasoning effort settings.
GPT-5.1-Codex is a version of GPT-5 optimized for agentic coding tasks in Codex or similar environments. It's available in the Responses API only and the underlying model snapshot will be regularly updated. If you want to learn more about prompting GPT-5-Codex, refer to our dedicated guide
GPT-5.1 is the OpenAI's best model for coding and agentic tasks across industries.
GPT-5 is our flagship model for coding, reasoning, and agentic tasks across domains.