Theory: Opus 5’s bizarre communication style was an anti-distillation feature, not a bug

A theory suggests that Opus 5's poor communication style was an intentional anti-distillation feature, rather than a bug. This strategy might have served as a "Trojan horse" for models trained on its outputs. The subsequent Opus 5.5, which offers a more pleasant interaction, includes a new anti-distillation mechanism called "Preserved Thinking." This mechanism protects the model's reasoning history by maintaining conversation state and preventing API users from altering system prompts around preserved reasoning blocks.

This theory uniquely connects Opus 5's communication style to an anti-distillation strategy, unlike other explanations that might attribute it to mere flaws or bugs.