Anthropic has struck a $9.1 billion agreement with Riot Platforms, a bitcoin mining company that has been building out AI data center capacity, according to Bloomberg.

Riot disclosed the deal on Monday, describing the counterparty only as a "leading frontier AI lab." Riot's Rockdale, Texas, campus will supply 191 megawatts of IT capacity under the terms of the 20-year lease, which extends through June 2048, the company said. Two five-year extension options could raise the total contract value to $16.1 billion.

Riot plans to bring capacity online in stages, reaching 96 megawatts by December 2027 and completing the full 191-megawatt buildout by June 2028, the company said. To fund the project's early construction phase, Riot arranged a $573 million interim financing facility through Morgan Stanley $MS as it works toward putting a permanent credit backstop in place.

Riot CEO Jason Les said in a statement that the two agreements together bring the company's total signed capacity to 241 megawatts and roughly $9.8 billion in long-term contracted revenue, all accumulated within six months. The earlier deal was with Advanced Micro Devices.