OpenAI has around 1 billion weekly active users, while Anthropic has around 130 million monthly active users. Most OpenAI users are free or lightweight users, while Anthropic users are mostly active and/or paying developers. But I think the user base is the most important thing, even free users. Look at Google, Microsoft, and all the other giants with large free user bases. It is not as if Anthropic is slowly absorbing OpenAI’s strength bit by bit.