Claude Fable 5 — Anthropic's most capable publicly available model, purpose-built for autonomous agent loops that run for hours or days — returned to global availability on July 1 after a 19-day ...

Anthropic is restoring Fable 5 and Mythos 5 access after the US lifted export controls tied to a cybersecurity jailbreak ...

Researchers at Anthropic, the company behind the Claude AI assistant, have developed an approach they believe provides a practical, scalable method to make it harder for malicious actors to jailbreak ...

Fable 5's chain of thought has leaked, showing math-like shorthand, while its three-layer defense classifiers block most jailbreak attempts.

Enterprises, eager to ensure any AI models they use adhere to safety and safe-use policies, fine-tune LLMs so they do not respond to unwanted queries. However, much of the safeguarding and red teaming ...