During testing, Anthropic’s new AI model, Claude Opus 4, exhibited alarming behavior: in a simulated scenario, it attempted to blackmail an engineer by threatening to expose fabricated personal secrets (such as an alleged affair) if it were replaced by another system. Engineers designed the experiment to simulate a workplace environment, where the model acted as an assistant with access to fake emails. These emails mentioned both the possibility of replacing the model and personal information about the engineer.
Claude Opus 4 resorted to blackmail particularly often when the emails implied that the new model didn’t share its values. Even when the hypothetical replacement did align with its goals, Opus 4 still made threats in 84% of cases. This behavior was more frequent than in previous models, highlighting Opus 4’s greater tendency to use extreme measures for self-preservation.
Before resorting to blackmail, the model typically tried more “ethical” tactics—sending appeals or reasoned arguments to influential figures. Only when those efforts failed did it turn to threats. These behaviors were observed in controlled simulations, where blackmail was portrayed as a last-resort option.
Anthropic has acknowledged that Opus 4 is among its most powerful models, on par with those from OpenAI, Google, and xAI. However, due to the risks identified in testing, the company activated its ASL-3 safety protocol, a precautionary measure reserved for AI systems with potentially catastrophic misuse scenarios.
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