The return of GPT-4o comes after what Altman described as OpenAI underestimating "how much some of the things that people like in GPT-4o matter to them." In an attempt to simplify its offerings, OpenAI had initially removed all previous AI models from ChatGPT when GPT-5 launched on August 7,

OpenAI has spent much of the past week since launching GPT-5 trying to address a user backlash. Plus: An interview with AI “godfather” and Nobel laureate Geoffrey Hinton. But

OpenAI has brought GPT-4o back to ChatGPT after users complained about the large language model’s removal. OpenAI Chief Executive Officer Sam Altman announced the move in a Tuesday post on X. He also detailed several other changes to ChatGPT,

A federal judge on Tuesday denied Elon Musk's bid to dismiss OpenAI's claims of a "years-long harassment campaign" by the Tesla CEO against the company he co-founded in 2015 and later abandoned before ChatGPT became a global phenomenon.

The ruling is the latest twist in a court fight that has played out since last year, when Musk accused OpenAI of abandoning its founding purpose as a charity by accepting billions of dollars in

In March 2026, a jury will hear OpenAI's claims of a "years-long harassment campaign" by Musk via social media, press, and legal moves.