Anthropic Just Outsourced Its $50 Billion Data Center Buildout to Wall Street
Anthropic announced a new infrastructure venture on August 10 called Theseus Infrastructure, built with investment firms Macquarie Asset Management and GIC to develop and lease data centers back to Anthropic under long-term agreements. Funds managed by Macquarie and Singapore's GIC will own Theseus and fund the majority of the equity for each site, with Anthropic committing only as the anchor tenant rather than the owner.
The structure marks a shift from how Anthropic described its data center ambitions a year earlier, when it said it planned to spend $50 billion building US data centers directly, starting with sites developed alongside Fluidstack in Texas and New York. Theseus moves that capital burden onto Macquarie and GIC's balance sheets instead, a financing pattern increasingly common across the AI buildout as compute demand outpaces any single company's willingness to carry the debt alone. Anthropic is already leasing capacity from TeraWulf, Hut 8, and SpaceX, and has separate multibillion-dollar cloud commitments with Google, Amazon, Akamai, and CoreWeave, according to Data Center Dynamics.
GIC has previously invested directly in Anthropic and brings a track record in the sector, including stakes in Vantage's EMEA data center platform and Equinix's xScale hyperscale facilities. Macquarie Asset Management has backed Netrality Data Centers and Applied Digital in the US and Virtus in Europe, though it exited earlier positions in AirTrunk and Aligned. Neither company disclosed a dollar figure for the Theseus partnership itself, and both said further site details are still being worked out, with an initial focus on the United States.
One detail carried over from Anthropic's existing public commitments: the company said it will cover any electricity price increases that consumers near the new sites might otherwise face, a pledge it first made earlier this year as data center power draw became a flashpoint in local grid debates. The arrangement puts Anthropic in the position of underwriting community electricity costs for facilities it will not directly own, on top of the long-term lease payments Theseus will collect once the sites come online.
The deal lands the same week Anthropic publicly confirmed it is assembling an in-house chip design team, adding a third front, financing, chips, and cloud capacity, to how the company is trying to keep pace with Claude's compute needs. Whether Theseus can break ground and deliver capacity fast enough to matter is now a question for Macquarie and GIC's project pipeline as much as Anthropic's.
Sources: Macquarie Group · Data Center Dynamics · Bloomberg · HPCwire