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Anthropic releases a version of its vaunted Mythos model to developers

Fast Company Tech Mark Sullivan June 9, 2026
Anthropic releases a version of its vaunted Mythos model to developers
AI Summary— plain English for professionals

# Anthropic's New AI Model Is Now Available to Everyone—With Some Safety Guardrails Anthropic released Claude Fable 5, its most powerful AI assistant yet, to the general public on Tuesday, though the company deliberately restricted it from answering certain sensitive questions about cybersecurity and biology to prevent misuse. The model significantly outperforms competitors like OpenAI and Google in complex tasks like coding and data analysis, making it potentially useful for professionals handling detailed technical work. To balance capability with safety, Anthropic designed the model to refuse roughly 5% of requests in high-risk areas and hand them off to a less powerful AI instead.

Anthropic on Tuesday released Claude Fable 5, a public, guardrailed version of its vaunted “Mythos” AI model. The AI startup said Claude Fable 5 is more capable than any other model it has released to the public, showing outstanding performance in software engineering, knowledge work, and vision

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