Anthropic's Fable 5.1 widens US-China AI model gap, but Chinese open-weight rivals gain traction

Anthropic released Claude Fable 5.1, claiming it leads global benchmarks in coding and complex knowledge work, extending the US lead over Chinese frontier models. However, Chinese open-weight models continue to gain commercial adoption, suggesting a bifurcated market where US leads in frontier capability while China competes on cost and accessibility. The strategic balance in AI remains contested despite the benchmark gap.