OpenAI Chief Executive Officer Sam Altman wants to spend trillions of dollars over time on the infrastructure required to develop and run artificial intelligence services. He just needs to figure out a way to raise that kind of money.

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,

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.

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.