Anthropic rolls out Claude Fable 5, but it's available for a limited time
infonewsLLM-Specific
industry
Source: BleepingComputerJune 9, 2026
Summary
Anthropic released Fable 5, a safer version of its powerful Mythos AI model that includes guardrails (safety restrictions) to block harmful requests related to cybersecurity attacks, biology, and chemistry. Because Fable 5 consumes computing resources much faster than other models, Anthropic is offering it free only until June 22 to Pro, Max, and Enterprise subscribers, after which it will switch to usage-based pricing.
Classification
Attack SophisticationModerate
Impact (CIA+S)
availability
AI Component TargetedModel
Affected Vendors
Anthropic
Related Issues
Monthly digest — independent AI security research
Original source: https://www.bleepingcomputer.com/news/artificial-intelligence/anthropic-rolls-out-claude-fable-5-but-its-available-for-a-limited-time/
First tracked: June 10, 2026 at 02:00 AM
Classified by LLM (prompt v3) · confidence: 85%