Your Agents Are Aging Too: Agent Lifespan Engineering for Deployed Systems [R]

In three linesAgingBench, a new longitudinal deployment benchmark, shows that swapping Claude Sonnet 4.6 for Opus 4.7 in the Claude Code CLI agent drops PyTest pass rate by ~15%. Memory policy alone drives a 4.5x spread in agent half-life across scenarios, larger than any model swap tested.

Summary generated by Claude — human-verified