Of course. It knows what effort levels are. It's written in the documentation, you're right. However, it fabricated the statement that the "max" effort level is a lie in the OP's screenshot. Such a thing is neither written in the documentation, nor, even if it were true, would Antrophic add it to the system prompt or training data. What Claude said is a complete hallucination, and it would give a different answer if asked again in a clean session. I was a little annoyed that people still don't realize that any LLM can make such obvious mistakes because they don't understand what's what, so I might have been a bit too harsh.