Much of Anthropic's internal software is now built by Claude, says Mike Krieger

victor_explore · x · 2026-09-30

Anthropic CTO Mike Krieger (co-founder of Instagram) says much of the software Anthropic staff use is now built, maintained and changed by Claude — one of the company's biggest shifts in the past year — and he's pushing to extend this to nearly all internal software. Commenter victorexplore adds: internal tools get agent-ified first because nobody files a ticket when Claude rebuilds a dashboard; the real challenge is data — once humans and agents both write to it, log who changed what or you stop trusting any of it.

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