interesting note at the bottom of the OpenAI help centre is that all these models are deprecated with the launch of GPT-5, and old models can only be used as a ChatGPT Pro user ($200/month)

<img src=“https://jackk.micro.blog/uploads/2025/screenshot-20250808-082222.png" width=“600” height=“533” alt=“Screenshot of the OpenAI Help centre about the rate limits and usage of GPT-5 across the different ChatGPT tiers. Text shown:&10;&10;“Model deprecations and old conversations&10;When GPT-5 launches, several older models will be retired, including:&10;&10;GPT-4o&10;&10;GPT-4.1&10;&10;GPT-4.5&10;&10;GPT-4.1-mini&10;&10;o4-mini&10;&10;o4-mini-high&10;&10;o3&10;&10;o3-pro&10;&10;If you open a conversation that used one of these models, ChatGPT will automatically switch it to the closest GPT-5 equivalent. Chats with 4o, 4.1, 4.5, 4.1-mini, o4-mini, or o4-mini-high will open in GPT-5, chats with o3 will open in GPT-5-Thinking, and chats with o3-Pro will open in GPT-5-Pro (available only on Pro and Team).&10;&10;Outputs may differ when continuing old conversations, since they’ll now use GPT-5 equivalents.&10;&10;For Free and Plus users, these changes take effect immediately. Pro, Team, and Enterprise users will also see the changes at launch but will have access to older models through legacy model settings.&10;&10;ChatGPT Pro users can enable access to legacy models by toggling on Show legacy models in ChatGPT settings.”">