The AI startup is chasing a $500 billion valuation, with backers betting it can become the next Apple or Google. There are reasons for skepticism.

With new tools and greater autonomy, OpenAI's flagship AI chatbot is more capable, and potentially more dangerous, than ever.

Current and former OpenAI employees plan to sell approximately $6 billion worth of shares to an investor group that includes Thrive Capital, SoftBank Group Corp. and Dragoneer Investment Group, in a deal that values the ChatGPT maker at $500 billion.

OpenAI reversed the change on Tuesday, allowing the previous model to be accessible by paid users, but the episode illustrates what researchers are calling “AI Psychosis,” where overly-pleasing chatbots exacerbate delusions and create a false sense of romantic love.

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,

A young woman took her own life after talking to an ChatGPT-based AI therapist, named Harry. In a devastating opinion piece for the New York Times, her mother, Laura Reiley, detailed the events leading up to Sophie's suicide.

OpenAI's Greg Brockman said startups that connect large language models to real-world applications are still extremely valuable.

He admitted that China's progress, particularly with open-source models like DeepSeek and Kimi K2, influenced OpenAI's decision to release its models.