Anthropic confidentially filing an S-1 is significant beyond the IPO itself. The disclosure process requires publishing unit economics on model training and inference at frontier scale. Once that data is public, it becomes the baseline by which every AI lab gets benchmarked. For product builders running on Claude's API, this is clarifying: your infrastructure partner is preparing to operate under public market scrutiny, which shapes pricing discipline and roadmap predictability in ways private labs simply don't face.