Former OpenAI boss Sam Altman boss pictured at firm's HQ amid reports of return

The ex-boss of leading artificial intelligence firm OpenAI has posted a picture of himself at its HQ, following reports he is set to return after being sacked on Friday.

In the post on X, formerly Twitter, Sam Altman is pictured holding a guest ID pass and comments: "First and last time i ever wear one of these".

The 38-year-old helped launch firm which created the popular ChatGPT bot.

On Friday the board dismissed Mr Altman saying it had lost confidence in him.

Reports this weekend, however, have suggested investors and employees are pushing for Mr Altman to be reinstated.

According to tech news site the Information, Mr Altman and Greg Brockman - another co-founder who quit on Friday as the company's president - were invited to the firm's San Francisco headquarters for talks on Sunday.

The BBC has contacted OpenAI for comment.

Mr Altman is seen as one of the most influential figures in the fast-growing generative AI space and his ouster sent shockwaves across the industry.

In a letter on Friday, the company's board accused him of not being "consistently candid in his communications with the board, hindering its ability to exercise its responsibilities".

It is not clear what he is alleged to have not been candid about.

Reports this weekend, however, suggested Mr Altman's sacking had angered current and former employees who were worried it might affect an upcoming $86bn (£69bn; €79bn) share sale.

The firm's venture capitalist backers and the tech giant Microsoft - which has a $10bn stake in OpenAI - have also called for his return, according to the FT.

OpenAI is widely seen to be a company at its peak, with lucrative investment pouring in, and ChatGPT - which was launched almost a year ago - is used by millions.

Mr Altman has been the face of the firm's rise. More than that, he is seen by many as the face of the industry more widely.

He testified before a US Congress hearing to discuss the opportunities and risks created by the new technology and also appeared at the world's first AI Safety Summit in the UK at the beginning of November.

His ouster sparked an outpouring of support from Silicon Valley bosses, including former Google chief executive Eric Schmidt who called Mr Altman "a hero of mine" and said that he had "changed our collective world forever".