I'm the same, but had a lot of issues getting structured output from Anthropic. Ended up always writing response processors. Frustrated by how fragile that was, decided to try OpenAI structured outputs and it just worked and since they also have prompt caching now, it worked out very well for my use case.

Anthropic's seems to have addressed the issue using pydantic but I haven't had a chance to test it yet.

I pretty much use Anthropic for everything else.