Anthropic, Macquarie and GIC Launch Theseus for AI Data Centers

Anthropic, Macquarie Asset Management and GIC have launched Theseus Infrastructure, a platform to fund, build, operate and lease hyperscale data centers back to Anthropic under long-term agreements, with an initial focus on the United States. Funds managed by Macquarie and GIC will own the platform and fund the majority of the equity on each project, while Anthropic has committed to covering the electricity price increases that consumer ratepayers might otherwise face from the new load.

Why it matters

An AI lab is no longer just the tenant signing a power purchase agreement. Anthropic is now a named party in the capital stack of the sites it will occupy, with Macquarie and GIC underwriting construction against Anthropic as the long-term, anchor-tenant counterparty. For a site owner or power broker chasing hyperscale work, that changes who sits across the table: instead of pitching a cloud operator or an unnamed SPE, developers can now structure deals around a platform where the AI company itself has pre-committed to backstop the community’s power costs, a term increasingly demanded by utility regulators and local governments before a project gets sited at all.

The numbers

Theseus’s own launch discloses no megawatt totals, dollar figures or named sites, an unusual gap for a platform framed as developing “at scale.” The clearer numbers sit in the commitment it extends: Anthropic’s November 2025 pledge to spend $50 billion on U.S. computing infrastructure, starting with sites in Texas and New York built with operating partner Fluidstack, projected to create roughly 800 permanent jobs and 2,400 construction jobs, with sites coming online through 2026.

What’s next

The near-term signal for builders and site selectors is which markets Theseus names first and whether its power-cost guarantee becomes the template other AI labs have to match to compete for scarce interconnection queue slots. Anthropic and Macquarie said the parties will now work together to identify and develop new sites, a process that will determine which metros beyond Texas and New York get the next wave of anchor-tenant-backed capital. Developers tracking the national data-center pipeline should expect the site list, not the funding structure, to be the next disclosure that matters.