Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model

Key Points:

• Anthropic has launched Claude Fable 5, a Mythos-class AI model designed for safe general use, with enhanced capabilities surpassing previous models in software engineering, knowledge work, vision, and scientific research.
• Fable 5 can operate autonomously for longer periods and outperforms Opus models on complex tasks, but includes conservative safeguards that redirect sensitive queries in cybersecurity, chemistry, and biology to Opus 4.8 to prevent misuse.
• The company is also releasing Claude Mythos 5, a version of the same model with fewer safeguards, specifically for cyberdefenders and infrastructure providers through Project Glasswing, claiming it offers the strongest cybersecurity capabilities globally.
• Pricing for Fable 5 and Mythos 5 is set at $10 per million input tokens and $50 per million output tokens, which is less than half the cost of the previous Claude Mythos Preview, with Mythos 5 access limited to trusted users including partners like Apple.
• Claude Fable 5 is currently included in Anthropic’s Pro, Max, Team, and Enterprise plans until June 22, after which it will require usage credits, with plans to reintegrate it into subscription plans once capacity allows.