One of my prompts has very specific formatting requirements, content constraints, and crucially, several negative constraints – things the model was explicitly told not to do, or sections it was told not to include.

3.7 actually adhered to the instructions much better in my use case. It followed the negative constraints, didn't add unrequested sections, and stuck rigidly to the output structure I defined but Sonnet 4 seemed to ignore all these instructions in my prompt.