Claude Opus 4.6 has definitely been nerfed in the last few days, especially in the Claude app.
Here's a comparison with Claude Code in Telegram, where I manually set Max reasoning effort.
(I hate that Anthropic does this regularly and keeps pretending it doesn't.)
@viticci Both make assumptions as to why you're going to the car wash. It also gave me a different response. Not that it matters, I have no car so the drive option is always wrong (I have gone to a car wash despite this too).
If you ask if the reason you're going matters, then it says you obviously need to drive if you're washing your car so that seems fairly reasonable, imo.
Federico Viticci 
Franklin Delano Stallone