AWS announced November 9 that Claude Fable 5.2 and Claude Mythos 5.2 are now available on Amazon Bedrock and Claude Platform on AWS.
According to Anthropic, Claude Fable 5.2 is designed for technical work including coding, mathematics and science. The company says the model can handle ambiguous, multi-step tasks, verify its own output, and run unattended for extended periods. Anthropic claims that in its alignment testing, Mythos 5.2 hallucinates less, completes tasks more reliably, and self-reports issues more honestly than Opus 5.5, Sonnet 5.5, and Mythos 5.1, and expects Fable 5.2 to behave similarly.
Anthropic identifies use cases including agentic coding across multi-repository codebases, long-running agents coordinating subagents on multi-day work, scientific research, financial analysis, and design work for 3D, hardware and motion applications.
Claude Mythos 5.2 is restricted to authorized users in two domains through Anthropic’s verification programs: cyber security work including security engineering, red teaming and penetration testing, and life sciences research, particularly biomolecular design and research synthesis.
AWS says that if a cyber security query is declined on Mythos 5.2, developers can retry on Opus 4.8, and if a biology query is declined, they can retry on Opus 5. On Amazon Bedrock, this retry must be implemented in code rather than happening automatically. If a declined request used the prompt cache, the refusal includes a fallback credit token that allows the retry to be billed as cache reads rather than as a new cache write.