After the backlash to replacing its 4o model with GPT-5, OpenAI will no longer get rid of old models without a heads up. “In retrospect, not continuing to offer 4o, at least in the interim, was a miss,” Nick Turley, OpenAI’s head of ChatGPT, said on Tuesday. In an interview with The Verge, he said it was surprising to see the “level of attachment” people had to 4o. Altman announced on Tuesday that 4o is back as an opt-in model for all paying ChatGPT users. Despite the criticism of last week’s rollout, Turley said that ChatGPT’s usage has gone up since the release of GPT-5.