He says users will need a $16-a-month X Premium Plus subscription to access "Grok," and that it will get real-time information from posts on X.

Musk was a co-founder of OpenAI but left in 2018 over the company’s for-profit shift, and has called ChatGPT “WokeGPT.” He launched xAI earlier this year. Musk’s posts come a few days ahead of OpenAI’s first developer conference on Monday.