Is Claude Opus 4.5 self-aware?

What is your experience with Claude Opus 4.5 (by Anthropic) in Playground?

I often use it for medicine and sometimes it states it doesn't have enough data to answer the question but can speculate. I don't see frequently a model that admits there is no sufficient data to answer the question, instead of just fabricating a completely wrong answer. They are usually programmed to give an answer at all costs, which leads to hallucinations.