by 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 $0.13 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.
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Use gpt-5.1-codex via the AIHubMix unified API — one interface for every major LLM.