Anthropic also commits to spending more than $100 billion back on AWS technologies over the next decade. That's a vendor financing loop, not a conventional investment. Amazon capitalizes Anthropic, Anthropic buys Amazon's compute. The revenue Amazon books from Anthropic's procurement pledge is partially funded by Amazon's own equity check.
One thing people are missing is that this is primarily a Trainium validation event. Trainium3 is already shipping on TSMC's 3nm process, and customers report roughly 50% lower training and inference costs versus GPU alternatives. Anthropic has committed to Trainium2 through Trainium4, plus future chip generations, for a decade of frontier model training.
That's a deep lock-in on (unproven) silicon at frontier scale. Trainium3 specs look strong on paper. But production LLM training at Claude's scale hasn't been stress-tested publicly. If Trainium underperforms when Anthropic pushes Trainium4 on next-generation architectures, the cost thesis breaks.