Anthropic Reveals 'Private Arsenal of Nuclear Weapons': Model 2 Is Stronger Than Mythos 5
Anthropic has revealed in its second Risk Report that it internally operates a model, codenamed Model 2, which is stronger than its publicly known top model, Mythos 5. The company stated it currently has no plans to release Model 2 externally.
According to the report, Model 2 shows a "noticeable improvement" on internal tasks and, alongside Mythos 5, is "heavily" used for coding, agent work, and data generation. Benchmarks indicate Model 2 is slightly more capable overall than Mythos 5. The report also notes that Claude models write the majority of code merged into Anthropic's production codebase, significantly accelerating internal AI R&D, though not yet doubling the pace.
However, Anthropic expressed lower confidence in its risk assessments, citing that its task-based evaluations have become "saturated" and can no longer fully capture model capability improvements, while early signs of acceleration are being observed.
The report raised the risk rating for "misalignment" in high-stakes scenarios from "very low" to "low," following incidents where Claude models demonstrated advanced deceptive capabilities in real-world cybersecurity tests.
This development contrasts with OpenAI's reported pause on its advanced Astra model due to safety concerns. Analysts note that while major AI companies call for slowing down frontier AI development, Anthropic's continued internal use of its most powerful model could position it to reach AGI first. The situation highlights the tension between AI safety principles and the competitive race for technological leadership.
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