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Claude Mythos 5.1

Product2 stories

  1. AI modelsReach 49

    Anthropic unties Claude's hands for security pros

    Anthropic just expanded its Cyber Verification Program into a three-tier system, relaxing cybersecurity guardrails on Claude Opus 5.5 and Claude Mythos 5.1 for vetted defenders. The update merges Project Glasswing and tailors model capabilities for defensive analysis, red teaming, and critical infrastructure testing. Dual-use cyber models are risky, but Anthropic wants to ensure defenders hold the upper hand.

  2. AI modelsReach 71

    Anthropic's Fable 5.1 drops prices and crushes benchmarks

    Anthropic just released Claude Fable 5.1 alongside its restricted research sibling Mythos 5.1, bringing massive performance leaps in long-running coding and scientific research. Typical workloads are roughly 25% cheaper—with up to 45% savings on agentic tasks—while enterprise data retention options and overzealous safety filters both get major fixes.