Introducing Claude Opus 4.5: the best model in the world for coding, agents, and computer use.
Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.
The Batman effect.
A female experimenter, appearing pregnant, boarded the train. In the experimental condition, an additional experimenter dressed as Batman entered from another door. Passengers were significantly more likely to offer their seat when Batman was present (67.21% vs. 37.66%).
[Francesco Pagnini et al.,"Unexpected events and prosocial behavior: the Batman effect", Nature, 2025]