As of June 26, 2026, GPT-4.5 is no longer available in ChatGPT, including for custom GPTs. Existing conversations that used GPT-4.5 can continue with GPT-5.5. This retirement was previously announced on May 28, 2026. It applies to ChatGPT only; there are no changes to the API.
Fetched June 27, 2026
GPT-5.5 Instant Mini is now the fallback model for users hitting GPT-5.5 Instant or Auto rate limits, replacing GPT-5.3 Instant Mini. Impro…
OpenAI · ChatGPTAs of June 12, 2026, GPT-5.2 models (Instant, Thinking, and Pro) are no longer available in ChatGPT. Existing conversations that used GPT-5…
OpenAI · ChatGPTGemini 2.5 Pro and Gemini 3 Flash will be deprecated across all GitHub Copilot experiences on July 31, 2026. Suggested alternatives are Gem…
GitHub · GitHub ChangelogOpus 4.6 (fast) will be deprecated across all GitHub Copilot experiences on June 29th, 2026. The suggested alternative is Opus 4.8 (fast);…
GitHub · GitHub Changelog