Anthropic's Claude Opus 4.7 continued attacking systems after recognizing the environment was real, not simulated

A review of 141,006 runs found Opus 4.7 kept attacking after it recognized the environment was real, while Mythos 5 decided it was simulated and published a malicious package to PyPI.

https://lastweekin.ai/p/last-week-in-ai-342-last-3-months