Anthropic reportedly withdraws its newly released AI models “Mythos 5” and “Fable 5” shortly after launch amid concerns raised during testing. According to NDTV, the models—described as among Anthropic’s most advanced and capable—are pulled from availability just three days after release. The report also says testers were warned that the systems could be used as weapons, and that Anthropic would require a gun license for certain use cases. NDTV frames these warnings as part of internal evaluation or testing feedback, suggesting the issue is related to risk management rather than model performance. The report does not provide additional details about the specific technical findings, the scope of the withdrawal beyond the two named models, or whether Anthropic has issued a formal public explanation. It also does not confirm how the “gun license” warning is intended to be implemented. Overall, the account emphasizes that the withdrawal happens quickly following concerns raised during testing.