Product
Fable 5
- First Reported
- Jun 10, 2026
- Latest Reported
- Oct 6, 2026
Reported Context (4)
- The CrowdStrike Cyber Superintelligence Lab evaluated the most advanced publicly deployed content safety classifier, which guards models such as Claude Opus 5.5 and Fable 5 (referred to hereafter as Frontier Model A). CrowdStrike Researchers Show How Attackers Can Bypass LLM Safety Classifiers
- targeting Anthropic’s Opus-class models; contemporaneously with this research, those models (and later, Fable 5) were equipped with a built-in classifier that automatically terminates the conversation when it detects PuzzleMask Uses Plain-Language Wrappers to Evade LLM Safety Gatekeepers
- 🇺🇸 US Directive Forces Anthropic to Suspend Fable 5 and Mythos 5 Access EU, UK and US Advance New Privacy, Data Protection and AI Rules
- Mythos has now been released to the public as Fable 5, although with restrictions that make it not particularly useful for security researchers. Pwn2Own Berlin 2026 Exposes Security Weaknesses Across AI Tools
CVE (2)
People (6)
MITRE ATT&CK (1)
Vendors (6)
Products (20)
Tools (3)
Industries (3)
Countries (4)
Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.