Anthropic Adds Up to $4.3 Billion to Microsoft Compute Deal

Anthropic increased its compute commitment to Microsoft by as much as $4.3 billion, bringing the agreement to between $47.2 billion and $49.2 billion, Data Center Dynamics reports, citing a figure first reported by The Information. The agreement was signed in November 2025 and amended several times through November 2026, as detailed in the second amendment to its IPO prospectus, the same filing that set the offering terms.

Anthropic must make the payments between November 2026 and June 2033 regardless of actual usage. The commitment cannot be canceled except for an uncured material breach by Microsoft or for certain capacity tranches that are not delivered.

The filing also says that Anthropic's August 2026 agreement with Lambda, about $34.9 billion of a roughly $41.3 billion commitment to Lambda, can now be terminated by either party because Lambda missed a deadline to secure a facility lease. Neither company had issued a termination notice as of the filing date, and Anthropic said it did not currently plan to terminate the agreement.