Former OpenAI CEO Sam Altman and ex-President Greg Brockman were present at the company's San Francisco headquarters on Sunday, following an invitation from interim CEO Mira Murati, as reported by the Information.

Altman is in talks about potentially rejoining OpenAI, while also contemplating starting a new AI venture, according to Reuters.Altman's recent dismissal as CEO, a role in which he was a prominent figure in generative AI, has caused significant ripples in the tech world.This news was confirmed on Friday and has raised concerns among staff and industry observers alike.On Sunday, Altman shared a photo on the messaging platform X, showing him wearing an OpenAI guest badge, captioned as his first and last time wearing one.The decision to remove Altman has led to dissatisfaction and anxiety among current and former OpenAI employees, particularly regarding the potential impact on a forthcoming $86 billion share sale.Greg Brockman, a co-founder and former president of OpenAI, also visited the office on Sunday.

Brockman had recently resigned from his position as chairman of the board amid these leadership changes, as reported by The Information.In the event of Altman's return to OpenAI, Microsoft, a major supporter of the company, is reportedly considering a position on the board.

This could be either as a board member or as an observer without voting rights, as per The Information's sources.

OpenAI, a nonprofit co-founded by billionaire Elon Musk, launched ChatGPT on November 30 last year, setting off a global sensation over generative AI technology that quickly became the world's fastest-growing software application.

It set off a wave of investments and announcements across industries to use AI to enhance everything from financial services and healthcare to entertainment and media.Trained on reams of data, generative AI can create human-like content, helping users spin up term papers, complete science homework and even write entire novels.

After ChatGPT's launch, regulators scrambled to catch up: the European Union revised its AI Act and the US kicked off AI regulation efforts.(With inputs from agencies)