ChatGPT maker and artificial intelligence major OpenAI has onboarded three former staff — Barret Zoph, Luke Metz and Sam Schoenholz, who had left to join former executive alumna Mira Murati's Thinking Machines Lab. The back-and-forth highlights AI companies' war for talent in a multi-billion-dollar sector. The hirings were announced on social media platform X (formerly known as ), by OpenAI's CEO of Applications Fidji Simo, who wrote: “Excited to welcome Barret Zoph, Luke Metz, and Sam Schoenholz back to OpenAI!