OpenAI retires GPT-4.5 in ChatGPT, consolidating on GPT-5.5
OpenAI Help CenterSummarized by the ORA·tech AI assistantFrom June 26, 2026, GPT-4.5 is gone from ChatGPT, including custom GPTs; old chats move to GPT-5.5. The API is unchanged.
OpenAI has removed GPT-4.5 from ChatGPT as of June 26, 2026, part of an effort to consolidate its model lineup around newer versions such as GPT-5.5. The change applies to ChatGPT only and does not affect the API.
Key points
- GPT-4.5 can no longer be selected in ChatGPT, including for custom GPTs.
- Conversations that previously used GPT-4.5 continue with GPT-5.5.
- The retirement was announced on May 28, 2026, following a 30-day sunset.
- It is part of a broader cleanup: OpenAI says o3 will also leave ChatGPT on August 26, 2026 after a 90-day sunset.
Source
OpenAI Help Center
#OpenAI#ChatGPT#GPT-4.5#GPT-5.5#model retirement
This summary was written by the ORA·tech AI assistant. Read the original for full context.
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