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Anthropic Releases Fable 5
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Anthropic Releases Fable 5

WireByte Staff · June 10, 2026

Anthropic launches Fable 5, a public version of its powerful Mythos AI model, with added safety measures, but warns of risks and collects user data

Key points

  • Anthropic, an AI company, has released Fable 5, a consumer-facing version of its Mythos-class AI model, previously considered too powerful for public release
  • Fable 5 is designed for complex tasks, such as software engineering and in-depth research, and is available on Claude's higher-tier subscription plans for a limited time
  • The model comes with safety guardrails, but Anthropic warns of potential risks, including cybersecurity concerns and data collection
  • User data, including prompts and outputs, will be retained for 30 days for trust and safety purposes, with no exceptions, even for enterprise partners
  • The release marks a significant change in Anthropic's approach to AI development and deployment, with potential implications for the industry and users
  • Analysts and experts, such as Jun Park and Jessica Eaves Mathews, have noted the significance of the data retention policy update and its potential impact on users and enterprise customers

Introduction to Fable 5

Anthropic, a leading AI company, has released Fable 5, a public version of its powerful Mythos AI model. The model, previously considered too powerful for public release, is now available on Claude's higher-tier subscription plans for a limited time.

Features and Capabilities

Fable 5 is designed for complex tasks, such as software engineering and in-depth research, and is built to handle work that unfolds over hours, days, or even longer. The model comes with safety guardrails, but Anthropic warns of potential risks, including cybersecurity concerns and data collection.

Data Retention Policy

The release of Fable 5 is accompanied by an update to Anthropic's data retention policies. User data, including prompts and outputs, will be retained for 30 days for trust and safety purposes, with no exceptions, even for enterprise partners. This change has significant implications for users and enterprise customers, and has been noted by analysts and experts.

Sources

WireByte Staff — Editorial Team

The WireByte editorial team synthesises technology news from multiple primary sources, verifies the facts, and links every source. Articles are produced with AI assistance and reviewed under our editorial policy.