GPT-5.1-Codex
coding modelOpenAI
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Key facts
| Made by | OpenAI |
|---|---|
| Type | coding model |
| Released | November 13, 2025 |
| Reads at once | 400,000 tokens |
| Price (API, per million tokens) | $1.25 in · $10 out |
| Input → output | text, image → text |
Questions about GPT-5.1-Codex
Who makes GPT-5.1-Codex?
GPT-5.1-Codex is made by OpenAI.
When was GPT-5.1-Codex released?
We first saw GPT-5.1-Codex listed on November 13, 2025.
How much does GPT-5.1-Codex cost?
Through OpenRouter it costs $1.25 per million input tokens and $10 per million output tokens. Prices change, so check the provider before you build on it.
How much text can GPT-5.1-Codex read at once?
Up to 400,000 tokens, roughly 300K words.
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