Claude Fable 5.2 is now available on AWS GovCloud (US)

Claude Fable 5.2 is now available on AWS GovCloud (US) and brings Anthropic's most capable generally available model for technical work to regulated customers. Fable 5.2 sets a new standard on the hardest projects in coding, math, and science, and Anthropic recommends it for fields like software engineering, scientific research, and finance, where judgment, iteration, and accuracy are critical. Claude Mythos 5.2, the same underlying model as Claude Fable 5.2, with its full cyber and bio capabilities retained for cybersecurity and biology research, is available through Anthropic’s verification programs. Claude Fable 5.2 can work for hours and up to days unattended, driving autonomous work and taking on bigger, more challenging projects. It takes on large, loosely defined engineering problems across multiple repositories and monorepos, tests its own work as it goes, and is more willing to question inherited conclusions, so it finds root causes previous Claude models miss. In Anthropic’s testing, it coordinated hundreds of subagents as a lead agent and flagged results that don't reproduce. Beyond coding, it develops new analytical methods for scientific research and brings frontier reasoning to quantitative finance. Anthropic has designated Fable 5.2 and Mythos 5.2 as covered models, which require data retention for safety monitoring. Until Enterprise Frontier Safeguards is available, eligible customers can use Fable 5.2 with zero data retention. Visit the Amazon Bedrock [abuse detection](https://docs.aws.amazon.com/bedrock/latest/userguide/abuse-detection.html) page to learn more about details regarding data retention for these models. To learn more, see the Amazon Bedrock [documentation](https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-anthropic-claude-fable-5-2.html), and [regional availability](https://docs.aws.amazon.com/bedrock/latest/userguide/models-region-compatibility.html#model-regions-anthropic).