As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT. This applies to GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro. Existing conversations that used GPT-5.1 will automatically continue on the corresponding current model: GPT-5.3 Instant, GPT-5.4 Thinking, or GPT-5.4 Pro.
Fetched May 30, 2026
GPT-4.1 is deprecated across all GitHub Copilot experiences (Copilot Chat, inline edits, ask and agent modes, code completions) effective J…
GitHub · GitHub ChangelogAll Gemini models and several others (GPT-5.2 Codex, GPT-5.4 nano) have been removed from Copilot Chat on the web to ensure reliable respon…
GitHub · GitHub ChangelogContinuing to retire older models with limited usage in ChatGPT. OpenAI o3 will be retired from ChatGPT on August 26, 2026 following a 90-d…
OpenAI · ModelsOpenAI o3 will be retired from ChatGPT on August 26, 2026 following a 90-day sunset period. GPT-4.5 will be retired from ChatGPT on June 27…
OpenAI · ChatGPT