Anthropic launches Claude Fable 5
Anthropic has released Claude Fable 5, a new Mythos-class model optimized for complex, long-horizon reasoning and autonomous software engineering tasks. The model features a hybrid safety routing system that redirects sensitive requests to Claude Opus 4.8 to balance capability with risk management.
Anthropic is pushing the frontier of autonomous agentic models while balancing capability risks through a novel hybrid safety routing system.
* The "Mythos-class" designation establishes a new capability tier specifically optimized for long-running agent workflows.
* The automatic rerouting to Claude Opus 4.8 for safety-flagged prompts indicates that Anthropic sees extreme capability and safety as a routing optimization problem.
* Pricing the model at double the cost of Opus 4.8 suggests substantial compute requirements for this new tier.
DISCOVERED
6d ago
2026-06-10
PUBLISHED
6d ago
2026-06-10
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