Anthropic IPO prospectus: 47% of 2025 sales, ~$2.16B, routed through AWS and Google Cloud

Anthropic's IPO prospectus discloses that it routed 47% of its 2025 sales, roughly $2.16B, through cloud partners Amazon and Google, paying an estimated $351M back in distribution fees. The filing lays bare Anthropic's deep dependence on Big Tech infrastructure at the moment it prepares to enter public markets.