OpenAI cofounder John Schulman is joining former OpenAI CTO Mira Murati’s stealth startup after departing Anthropic just five months after signing on, two sources familiar with the matter told Fortune.It remains unclear why Schulman chose to leave Anthropic so soon after joining, as well as what his role will be at Murati’s company. The startup has not yet announced a name or a clear product direction, though it has already made headlines for poaching employees from OpenAI, Character AI, and Goo...