Anthropic’s new AI tool Cowork was written fully by Claude Code, says creator

AI company Anthropic has unveiled a new product called Cowork, and in a striking twist, the tool was built almost entirely by AI itself.

Boris Cherny, the creator of Claude Code at Anthropic, revealed that Cowork was written pretty much fully by Claude Code. When asked on X how much of the product had been authored by the AI tool, Cherny replied bluntly, “All of it.”