Artificial intelligenceWashington had told company to suspend overseas use of powerful modelAccess to Mythos has been limited since its release due to its ability to identify cybersecurity vulnerabilities. (Photo by Yohei Fukai)KEISUKE MIYAKAWA, YUKI NAKAMURA and KAI ISHIZAKIAugust 28, 2026 00:36 JSTTOKYO -- Top Japanese banks have regained access to Anthropic's powerful Claude Mythos artificial intelligence model, Nikkei learned Thursday, after the U.S. government had ordered overseas access suspended in June over cybersecurity concerns.