Claude Fable 5 takes the top spot on Artificial Analysis' intelligence index

Anthropic's Claude Fable 5 (adaptive reasoning, max effort) now leads the intelligence index, narrowly ahead of GPT-5.6 Sol — though GPT-5.6 still edges it on the coding-specific score. Four of the top six slots now split between just two labs, with Kimi K3 the only non-Anthropic/OpenAI model to crack the top four.