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Anthropic runs unreleased Model 2 stronger than Claude Mythos 5

Anthropic said it is operating an internal AI model, Model 2, that performs better than its top publicly known model, Claude Mythos 5, but it does not plan to release it. In an AI risk report, the company disclosed safety review results for Mythos 5 and Model 2 and described Model 2 as slightly more capable. Employees also rated it as improved on many tasks, though gains were limited. Benchmark and safety test results were mixed.