OpenAI cofounder John Schulman is joining previous OpenAI CTO Mira Murati's stealth start-up after departing Anthropic just five months after signing on, two sources acquainted with the matter told Fortune.

It remains uncertain why Schulman picked to leave Anthropic so soon after joining, in addition to what his function will be at Murati's company. The startup has not yet revealed a name or a clear product direction, though it has already made headlines for poaching workers from OpenAI, Character AI, and Google DeepMind. Schulman's departure from Anthropic was initially reported by The Details, but his transfer to Murati's startup has not yet been reported.

A representative from Murati's business declined to comment. Schulman did not return an emailed request for comment. The 2 sources, whose identities are known to Fortune, understood the relocation through direct discussions with relevant parties. They were approved anonymity because they were not licensed to share the not yet public details.

Schulman left OpenAI in August 2024, with a message on X saying he desired to "deepen my focus on AI positioning, and to start a new chapter of my career where I can go back to hands-on technical work. I've decided to pursue this objective at Anthropic, where I believe I can gain brand-new viewpoints and study together with individuals deeply engaged with the topics I'm most thinking about."

To be clear, he included, "I'm not leaving due to absence of support for positioning research study at OpenAI. On the contrary, business leaders have actually been very committed to investing in this location. My decision is a personal one, based upon how I desire to focus my efforts in the next stage of my profession."

Murati left OpenAI in September 2024, saying she wanted to "develop the time and space to do my own expedition." In October 2024, she remained in speak to raise over $100 million in funding for the stealth startup, according to media reports. Last month, the startup made numerous prominent hires, including Jonathan Lachman, previous head of unique jobs at OpenAI.

Among the sources also informed Fortune that in a sign of a substantial organizational shift, Murati has actually also tapped Christian Gibson, [forum.batman.gainedge.org](https://forum.batman.gainedge.org/index.php?action=profile