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Model page

GPT-5.1 latest

GPT-5.1 model used in ChatGPT. Continuously updated for the latest chat improvements.

Use in chatPricing4o-latest update

Key dates

We use concrete dates and keep them consistent across the site.

ChatGPT

GPT‑4o retirement (ChatGPT)

OpenAI is retiring GPT‑4o inside ChatGPT on February 13, 2026. This does not automatically imply API removal.