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GPT-5 launch retires GPT-4o, o3 and other models
GPT-5 replaced GPT-4o, o3 and other older models in ChatGPT; old chats switched over
Was Default: GPT-4onow Default: GPT-5
What this means for you
Users lost the ability to choose older models such as GPT-4o and o3; everything moved to GPT-5. Paid access to some of them came back five days later.
Evidence
ChatGPT's release notes for August 7, 2025, as captured the next day: 'When GPT-5 launches, several older models will be retired', listing GPT-4o, GPT-4.1, GPT-4.5, GPT-4.1-mini, o4-mini, o4-mini-high, o3 and o3-pro. Old chats open in the closest GPT-5 model.
- GPT-4o, GPT-4.1, GPT-4.5, o3, o4-mini and others
- Was Selectable in ChatGPTRetired; chats switch to GPT-5
- Default model
- Was GPT-4oGPT-5
Sources
Effective Aug 7, 2025 · First recorded Aug 7, 2025 · Reconstructed · High confidence