> Aren't they losing money on the retail API pricing, too?

No, they aren't, and probably neither is anyone else offering API pricing. And Anthropic's API margins may be higher than anyone else.

For example, DeepSeek released numbers showing that R1 was served at approximately "a cost profit margin of 545%" (meaning 82% of revenue is profit), see my comment https://news.ycombinator.com/item?id=46663852