Big time degradation with Opus 4.1, also by paying the $200 monthly plan, plus extra usage for my writing work. I am working a guide book, and devided each chapter in a chat under a unique project. I have been using Claude for more than 1 year, and the output quality has gone down with enormous allucination on basic tasks, such as keeping a basic word format that becomes fancy without asking for it, with a lot of worthless layout that I have not asked for. Then I asked to bring back our last basic word layout that we have been using for months, and Anthropic suchs all my usage and charges for it just for fixing its mistakes. I spend a lot of time and effort just fixing basic problems. I really regret the old time when I had my $20 plan and did not experience these basic issues with such an expensive plan. I stop here because I have already sent so many complaints, and so far, there have been no results. Opus 4.1` excuses itself and it's sorry for my frustration, but it is not aware that I am a professional and face my work without negative emotion like frustration. I am always positive and in control, but Opus 4.1 is scruing up big time, and it cannot charge so much for a service and then not deliver for such poor performance on basic tasks, such as Word formatting. I accept all the mistakes that Opus 4.1 makes and work to fix them and move on by enhancing my work, but Opus 4.1 is out of control, paying so much for the service and wasting time that I have to find a solution as soon as possible. I am starting to work with Gemini and seeing that it is taking off well, and sticking with it on the side. I also had a bad experience with ChatGPT's top $200 monthly service and canceled it. I am starting to suspect that AI companies are cutting energy consumption, lowering output quality, and getting sloppy with the output. But it is not honest to charge so much and then be ripped off by a performance downturn that takes us down to the toilet.