These are growth rates. They are relative to the base adoption rate. This post blog.tickertrends.io/p/anthropic-... from the same org a month ago, shows that Anthropic's revenue is almost 50% higher than OpenAI's.
blog.tickertrends.io
Anthropic Is Tracking Above OpenAI in ARR, but Its Growth Is Beginning to Decelerate
TickerTrends tracking Anthropic at $74.1B ARR versus $41.3B for OpenAI, with recent data pointing to slowing momentum