Amazon Adds Up to $25 Billion to Anthropic Stake, Locks In $100 Billion AWS Spend

Amazon said Monday it will invest up to $25 billion more in Anthropic, with $5 billion flowing immediately and another $20 billion gated to unspecified commercial milestones. The Claude maker, in return, has committed to spending more than $100 billion on Amazon Web Services over the next decade, securing up to 5 gigawatts of compute on Amazon's custom Trainium silicon. The arrangement brings Amazon's total investment in Anthropic to about $33 billion, priced at a $380 billion valuation that venture firms already consider stale.

The money pattern is becoming familiar. Two months ago Amazon funded up to $50 billion of OpenAI's $110 billion round as part of a parallel $100 billion cloud commitment, a deal with the same closed-loop structure we wrote about in December. Amazon writes a check. The lab sends it back as purchase orders for Trainium chips and Graviton cores. Revenue booked, stake enlarged, infrastructure leased, all inside the same balance sheet.

This time Amazon's partner is Anthropic, which says its annualized revenue has jumped from roughly $9 billion at the end of 2025 to more than $30 billion today. That surge broke things. Free, Pro, Max, and Team users have hit throttles during peak hours, and developers on Claude Opus 4.6 complained about quiet performance degradations. Anthropic CEO Dario Amodei framed the deal as triage in the announcement: "Our users tell us Claude is increasingly essential to how they work, and we need to build the infrastructure to keep pace with rapidly growing demand."

What 5 gigawatts buys

You can picture the scale in grid terms. A single nuclear reactor puts out about 1 gigawatt. Anthropic is renting the computational equivalent of up to five of them. Significant Trainium2 capacity lands in Q2. Nearly 1 GW of combined Trainium2 and Trainium3 arrives by year-end, per Amazon. The full 5 GW stretches through Trainium4, which AWS says will deliver more than 2 exaflops of FP4 performance in a single server. Trainium4 does not ship yet.

Anthropic already runs more than a million Trainium2 chips inside Project Rainier, the cluster it and Amazon built in 2025. That's the existing floor. The new deal adds additional data-center campuses, plus an expansion of inference capacity in Asia and Europe.

Amazon's silicon bet, now at scale

Andy Jassy, Amazon's CEO, has been telling Wall Street for months that the custom chip business is "on fire." The numbers back him up. Trainium, Graviton, and the Nitro networking cards together hit a $20 billion annualized revenue run rate, doubling from $10 billion earlier in the year, according to Amazon. That chip line was always the real prize of the Anthropic relationship. It was also, visibly, the prize of the OpenAI deal.

For Jassy, Anthropic is a reference customer at hyperscale, and a way to keep Nvidia and Google's TPU roadmap from running the table on AI silicon. Amazon's capex plan reflects the stakes. Roughly $200 billion expected this year, most of it going into data centers.

Circular, and getting larger

Critics note the loop. Amazon funds Anthropic, Anthropic funds Amazon, and the math only works if enterprise and consumer demand keeps accelerating at current rates. If revenue growth stalls, the spend pledges look exposed. Amodei has acknowledged the risk publicly. In a December interview he warned that if Anthropic's assumptions on compute spend and revenue growth are even slightly off, the company could fail.

OpenAI executives spent last week telling investors Anthropic was operating on a "meaningfully smaller curve" and had made a "strategic misstep to not acquire enough compute." Monday's deal was the answer. It also lands while Anthropic remains barred from Department of Defense contracts pending a supply-chain risk designation the company is contesting in court.

What got bigger, what did not

Anthropic's multi-cloud story is officially intact. Microsoft put in up to $5 billion last November against $30 billion of Azure commitments. Google and Broadcom expanded their partnership earlier this month for multi-gigawatt capacity. CoreWeave closed a deal in April too.

But AWS is now dominant on the roster. Amazon Bedrock already runs most of its inference on Trainium, and the full Claude Platform is coming into the AWS console in private beta, meaning any AWS customer can reach Claude with no extra contract, credential, or billing relationship. Anthropic's bookings, not its independence, set the gravitational center now.

Amazon shares rose about 2.7% in extended trading. Anthropic is eyeing an IPO. Venture firms have reportedly offered capital at valuations north of $800 billion. Monday bought time for the company to test how far demand can still stretch before the bill comes due.

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Harkaram Grewal

New Delhi

Freelance correspondent reporting on the India-U.S.-Europe AI corridor and how AI models, capital, and policy decisions move across borders. Covers enterprise adoption, supply chains, and AI infrastructure deployment. Based in New Delhi.