John Schulman, an OpenAI co-founder who joined Anthropic last year, has left his role at the artificial intelligence startup, the company said late on Wednesday.

John Schulman has left his position at Anthropic. He was the co-founder of OpenAI and joined the company’s competitor, Anthropic, last summer. According to a Bloomberg report, AI researcher John Schulman has submitted a resignation.

John Schulman, a prominent artificial intelligence researcher who co-founded OpenAI, has left rival firm Anthropic, a job he held since the summer.