If that's true, they are using a separate search API to get search results and feed it into a regular Claude API call. The difference here is that Anthropic is integrating it directly, like OpenAI and Google have. It doesn't look like it's in the API yet, but presumably that's coming. Then, as with gpt-4o and the Gemini models, you can make a single API call and it will do the searching for you and incorporate the results.