Over the last two days, I have observed a significant degradation in Cloud Sonnet 4. Today, I checked the model, and it replied that it is version 3.5. Model 4 thinking identifies itself as 4. Two days ago, the results were fantastic, but today, its output is terrible! I added a screenshot of how the model identifies itself.
I checked all the models, and they identify themselves correctly but only sonnet 4 shows it 3.5.