Injection Resistance Is a Model Property. Trust Is a System Property.
The most exciting line was buried in a system card Anthropic launched Opus 5 this week, and the benchmark table is the part everyone screenshotted: state-of-the-art agentic coding, a jump from 1.5% to 30.2% on ARC-AGI-3, frontier knowledge work at roughly half the price of the model it replaces. All real, all impressive. But the line worth sitting with came from Boris Cherny, and it wasn’t on the benchmark chart. It was, in his own words, “a bit buried in the system card”: ...