How GPT-6 Became No. 1: Artificial Analysis CEO Explains The Much-Debated Index Updates

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Artificial Analysis updated its Intelligence Index twice within days after GPT-6 Astra launched, moving GPT-6 Astra to a shared first place with Anthropic’s Claude Fable 5.1. The displayed score for both models was 53 after Index v4.3, down from GPT-6 Astra’s 61 under Index v4.1. The changes reflect revised test methodology—adding new task benchmarks, removing one that had saturated, and increasing private-evaluation weighting from 40% to 45%—so the leaderboard can shift quickly and comparisons must use the same index version.