[smca]

That's right! Breakdown here for the API: https://www.anthropic.com/pricing#anthropic-api

[brokensegue]

why would someone pick opus at these prices?

[eaplant]

Someone who has built infrastructure or system prompts that use Opus will probably continue with Opus until they verify that everything works on Sonnet 3.5

[MallocVoidstar]

Benchmarks don't cover all possible use cases, for one. There's always the possibility that a model does better on every benchmark thrown at it, but for your specific use case it does worse in practice.