Claude Fable 5: a Mythos-class1 model

Claude Fable 5, Anthropic's inaugural Mythos-class model available to the public, represents a significant leap in advanced processing. Key features include: • Sophisticated safety classifiers for risky queries • Automatic routing to Opus 4.8 for sensitive domains • Rapid code migration capabilities • Optimized for knowledge work and coding tasks This model is engineered for high performance, demonstrated by Stripe's successful migration of 50 million lines of Ruby code in a single day. Rather than outright refusing potentially risky queries, Fable 5 employs a robust safeguard system that intelligently routes such requests to Opus 4.8. This process, triggered in less than 5% of sessions, ensures responsible handling of content related to critical domains such as cybersecurity and biology while maintaining broad utility for other applications. Fable 5 is ideal for developers, engineers, and organizations requiring a powerful processing tool for challenging technical problems. It offers a cost-effective solution with an API available at $10 per million input tokens and $50 per million output tokens. Access is also included free with Pro, Max, and Team plans through June 22. This makes it an invaluable resource for large-scale development projects, code modernization efforts, and advanced data processing needs.