Meta (META) AI researcher Andrew Tulloch is leaving to go to Anthropic, reports WSJ

Individual departures of this kind rarely reprice the equity on their own; the read-through that has mattered in comparable episodes is whether a move signals attrition in a specific research effort or compensation pressure across the lab, since the large platforms have historically responded to poaching waves with retention packages that feed into expense guidance. The distinction worth drawing is between a single high-profile exit, which tends to be noise, and a pattern of departures from one team, which has preceded visible slowdowns or restructurings of research programmes in past instances. For the acquiring lab, senior hires of this kind have typically coincided with fundraising or capability pushes, making Anthropic's own announcements the natural follow-on. Worth watching are further exits from the same research group, any company comment on retention, and capex and opex language at the next earnings print, where AI talent costs have repeatedly surfaced.