OpenAI plans to allow a wider range of content, including erotica, on its popular chatbot ChatGPT as part of its push to "treat adult users like adults", says its boss Sam Altman.

In a post on X on Tuesday, Mr Altman said upcoming versions of the popular chatbot would enable it to behave in a more human-like way - "but only if you want it, not because we are usage maxxing".

The move, reminiscent of Elon Musk's xAI's recent introduction of two sexually explicit chatbots to Grok, could help OpenAI attract more paying subscribers.

It is also likely to intensify pressure on lawmakers to introduce tighter restrictions on chatbot companions.