Anthropic IPO filing pledges $518B AI infrastructure buildout over 10 years, mostly non-cancelable

Anthropic's confidential IPO prospectus reveals plans to spend at least $518 billion over a decade on AI infrastructure with six partners including Google, Amazon, Microsoft and Broadcom. About 80% of that sum is non-cancelable or payable regardless of usage, with Microsoft's $31.4B commitment through May 2033 and Broadcom equipment leases of $161.2B locked in. The disclosure ranks among the largest AI buildout commitments on record.