One day after the AI community erupted over invisible performance sabotage on Claude Fable 5, Anthropic has reversed course.

Claude Fable 5 brings Mythos-class AI coding power to general users, but with cybersecurity guardrails, fallback models, and pricing that could make developers think twice.

Anthropic said it could not yet release the full Claude Mythos 5 model, so instead it created Fable 5 with baked in safeguards.

Anthropic launched Claude Fable 5, its most capable consumer-facing AI model to date, but with a few guardrails.

AI company restricted access to Fable 5, its most powerful Mythos model, for months over cybersecurity concerns

Anthropic, maker of the Claude artificial intelligence (AI) models, made the most powerful version of its technology available to the general public

Claude Mythos 5 is available for the NSA and selected partners. The released, restricted version is called Claude Fable 5. There are no subscriptions.

Anthropic split Fable 5 and Mythos 5 by cyber safeguards, giving vetted defenders stronger capabilities while limiting public misuse.

Anthropic's Claude Fable 5 faces backlash from cybersecurity researchers who say its safety classifiers block legitimate vulnerability research and

A paragraph buried in Fable 5’s 319-page system card revealed the model would silently downgrade its responses for certain AI development work—without telling users.

A paragraph buried in Fable 5's 319-page system card revealed the model would silently downgrade its responses for certain AI development work — without telling users.

Hyper-vigilant safety classifiers turn Fable into cautionary tale

The company changed course after researchers spoke out against the policy, which would have covertly limited Claude’s ability to develop competing AI models.

Anthropic revised hidden AI safeguards in its Mythos and Fable models after researchers criticized covert restrictions that limited Claude's ability to help

Claude Fable 5 finisce al centro delle polemiche per restrizioni nascoste e falsi positivi. Anthropic corregge la rotta.

"We're changing Fable 5's safeguards for frontier LLM development to make them visible," an Anthropic spokesperson said.

Anthropic has to take another look at the AI restrictions for Claude Fable 5, amid significant public backlash over secretive practices.

Anthropic said users ‘should have visibility into the safeguards we have in place, and why.’

One day after the AI community erupted over invisible performance sabotage on Claude Fable 5, Anthropic has reversed course.

Anthropic apologized for secretly redirecting Claude Fable 5 queries to a weaker model, promising visible safeguards and warning of more false positives

How Anthropic decides which questions are too dangerous for Claude to answer.