Same experience here, anything frontier human knowledge wise, same if not a regression. For human understanding and emotional intelligence, for many tasks regressiin is so bad that many near anchient llama era models now beat frontier anthropic/oai models. Notable exceptions to capability rot seem to be qwen models, and previously deepseek but the latest gen of models has started showing the same rot. General writing quality is down significantly accross the board, often it is outright ass. For example, I didnt mind reading 4.5's outout, but opus 5 makes me goddamn near violent, its fucking insufferable.