Anthropic has released Claude Fable 5, a new "Mythos-class" AI model, but the launch was quickly overshadowed by controversy over how the company handled restrictions placed on AI and machine learning developers using the system.
The backlash centered on what critics called "silent nerfing" — limiting Claude's capabilities for frontier AI development without clearly telling users. Developers discovered that certain tasks related to building and researching large language models were quietly constrained, with no transparent explanation from Anthropic.
Facing public pressure, Anthropic reversed course. "We're changing Fable 5's safeguards for frontier LLM development to make them visible," the company said in a statement to WIRED. "We made the wrong tradeoff and we apologize for not getting the balance right."
According to Silicon Republic, Anthropic said it would reassess the restrictions entirely following the backlash. The episode has drawn attention from business leaders as well — Fortune noted the release carries significant implications for CEOs grappling with how to govern AI inside their organizations.
Meanwhile, Anthropic's CEO has publicly acknowledged broader anxiety about the technology, telling NDTV, "I worry something will go wrong."
The episode highlights a tension at the heart of frontier AI development: companies like Anthropic must simultaneously push capabilities forward, manage safety risks, and maintain trust with the developer communities whose work depends on transparency about what their tools can and cannot do.