In the accelerating contest to define what artificial intelligence should be allowed to do, Anthropic has released Claude Opus 5.5 — a model distinguished not by raw power, but by deliberate restraint. The company has chosen to foreground cybersecurity safeguards at a moment when competitors are racing toward capability and cost reduction, framing limitation itself as a form of leadership. It is a rare instance in technological history where a company's most prominent feature is what its product refuses to do.