Six Months of the Identity Layer: Why Anthropic, Microsoft, and OpenAI All Made the Same Bet (opens in new tab)

A six-month consensus In February 2026, Anthropic's Alignment Team published the Persona Selection Model paper, framing AI assistants as "a selection among pre-trained characters, where the character's traits are the behavior." Five months later, on June 2, 2026, Microsoft Build 2026 announced: "Windows assigns agents a local ID or a cloud provisioned identity backed by Entra and attributes all activity from the container to that identity." Three days after that, on June 5, OpenAI rolled out ...