Anthropic Is Likely Generating at Least 35% More Revenue Than OpenAI

On New Year’s Day, OpenAI leaders would have been happy to hear that the company’s monthly revenue would rise more than 50% over the first five months of 2026, roughly in line with the projections it previously shared with investors. But they’re not likely to feel that way now: That pace looks downright tame compared to that of Anthropic, whose revenue grew five times in the same period, leapfrogging OpenAI’s.

Anthropic was recently generating revenue at an annualized rate of close to $45 billion. OpenAI’s current run rate couldn’t be learned but it recently crossed $30 billion, and one person familiar with the numbers said it isn’t much higher now. If we estimate their annualized rate now is around $33 billion, that would mean Anthropic’s revenue is about 35% higher. And things aren’t likely to change anytime soon if OpenAI’s growth rate doesn’t accelerate materially.