OpenAI just quietly retired the last of the GPT-4 models — and it feels like the end of an AI era

The logo of GPT-4.5 is displayed on a smartphone screen.

• OpenAI is retiring GPT-4.5, the final GPT-4 model still available in ChatGPT
• The move closes the chapter on the AI model that helped spark the generative AI boom
• Some people are already nostalgic for GPT-4 and GPT-4o, despite newer models being more capable

It was easy to miss because there was no big announcement, but OpenAI has confirmed it is retiring the last of the GPT-4 models from ChatGPT. A simple post in ChatGPT’s release notes said: “Today, we’re continuing to retire older models with limited usage in ChatGPT so we can better serve our newer, most capable models.”