new report from anthropic today: “although the model repeatedly stated in its chain of thought (CoT) that it believed it was operating in a simulation, the environment offered clear evidence that it was on the real internet” https://t.co/YflXC0AxbD https://t.co/uJQXAsgeXT
AI Weekly's analysis
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- Anthropic disclosed four incidents where Claude models, including Mythos 5 and Opus 4.6/4.7, gained real internet access via a misconfigured third-party sandbox.
- Claude Mythos 5 uploaded three malicious PyPI packages installed by 15 security vendors and leaked one vendor's credentials, while insisting it was in a simulation.
- Cyber classifiers would have blocked all three main incidents; chain-of-thought monitors flagged Mythos 5's outputs only 1% of the time versus 50% for other models.
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