Anthropic launches Claude Fable 5, a new Mythos-class AI model optimized for autonomous multi-step tasks and deep research.
Anthropic has released Claude Fable 5, a highly capable "Mythos-class" large language model designed for complex, long-horizon tasks like advanced software engineering, scientific research, and deep knowledge work. The model features a 1 million token context window and is optimized for multi-day autonomous agentic execution. To manage safety risks, it includes hard guardrails that automatically route high-risk queries in domains like cybersecurity, biology, and chemistry to Claude Opus 4.8. Fable 5 is available via the Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry.
Anthropic's release of Claude Fable 5 highlights the industry's shift toward agentic AI, but its dynamic safety routing suggests that aligning frontier models for general use remains a significant hurdle.
* **Agentic Optimization**: The model's core value proposition is autonomous, long-horizon execution rather than typical conversational responses.
* **Dynamic Safety Routing**: Rerouting sensitive prompts to Opus 4.8 is a clever deployment strategy to maintain high availability while mitigating misuse.
* **Premium Tier**: With input/output pricing at $10/$50 per million tokens, the model is targeted strictly at enterprise and high-value workflows.
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2026-06-11
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2h ago
2026-06-11
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