In my reading, Amazon is giving $5B of usage credits in exchange for shares. If Anthropic works out, it's a good deal for Amazon. If it doesn't, they lose on their invesment sheet, but they got ~ $5B in revenue, so it looks good on their operating sheet. And it helped justify a build out that they can sell to others.
For Anthropic, this lets them operate for more time without having to make numbers work. If Anthropic works out, they'll figure out the $100B commitment later. If it doesn't work out, it's not their problem.
It's probably faster to build up amazon's capacity with amazon's money than to build owned capacity with someone else's money at the scale they're looking to build out.
> Today’s agreement will quickly expand our available capacity, delivering meaningful compute in the next three months and nearly 1GW in total before the end of the year.
They need a bunch of compute, now.
so basically ...
you could view this as a kind of discount, but instead of paying less later, you get some cash now and then pay full later.
"Claude I'm evaluating whether I should host my app on AWS or Google Cloud. Provide me with an analysis on my options." "After a detailed analysis, AWS is clearly your better option."