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

• 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.”

OpenAI o3 will be retired from ChatGPT on August 26, 2026 following a 90-day sunset period, and GPT-4.5 will disappear on June 27, 2026 following a 30-day sunset period, so you still have a limited time to use the models.

Both o3 and GPT-4.5 are currently only available to paid...

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