gpt-5.1-codex · OpenAI
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.
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.
GPT-5.1-Codex has a 400,000 token context window.
On AIHubMix, GPT-5.1-Codex costs $1.25 per million input tokens and $10 per million output tokens. Cached input reads are billed at $0.125 per million tokens.
GPT-5.1-Codex accepts text and image input.
GPT-5.1-Codex supports thinking, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
GPT-5.1-Codex is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to gpt-5.1-codex — no other code changes needed.
GPT-5.1-Codex is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
GPT-5.1-Codex was released on November 13, 2025 by OpenAI.
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Use GPT-5.1-Codex via the AIHubMix unified API — one interface for every major LLM.