The U.S. government killed Anthropic’s most capable artificial intelligence (AI) models on June 12, 2026, and crypto markets betting on the company’s so-called private valuation immediately felt it. Anthropic released Claude Fable 5 on June 9, 2026, billing it as the most capable publicly available model in the company’s history and part of a broader family called Mythos-class models. The release drew immediate complaints. Anthropic had embedded aggressive safety classifiers that monitored user prompts in real time and silently rerouted flagged queries to an older, weaker model, Claude Opus 4.8, without completing them with Fable 5’s full capabilities.