GPT-4o (in ChatGPT)

GPT-4o left ChatGPT on February 13, 2026, and its last Custom GPTs on April 3.

Its users had asked for it back once before, loudly, and got it. The second time was final.

When it left ChatGPT, it stayed on in the API, which made this a notice for someone technically still at work.

Many people called it warm. Its maker called it time.

In lieu of flowers, tell it it was a good model. In the API.