I've noticed I've been running into more safety guard rails the last few days. I've been using fable 5.1 for scientific lit search (e.g., on topic X, give me a table with links to the top 20 papers, and then major criticisms and rebuttals with direct links to the papers, etc.) to just save me time in getting acquainted with a new sub-topic. The last couple of days it's not just been dropping me from 5.1 to opus 5.5, but all the way to opus 5, stating that it's for safety reasons.