[AI]■ STORY TIMELINE
CLAUDE FABLE 5 BEATS GPT-5.5 ON MATH BY 13 POINTS
Anthropic's Claude Fable 5 achieved 88% accuracy on FrontierMath's hardest problems, outperforming OpenAI's GPT-5.5 at 75%. The gap represents a dramatic acceleration in AI mathematical reasoning capabilities.
The Decoder+0m
Anthropic's Claude Fable 5 hits 88 percent accuracy on the hardest FrontierMath tier, a massive jump from Opus 4.5, whic…