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Agentic Workflows

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Saturday, 5 September 2026

GPT-6 Still Behind Fable 5.1 As Artificial Analysis Overhauls Intelligence Index

Trending Topics 1 month ago 30 ● 19 sources

Artificial Analysis released Intelligence Index v4.2, reworking the benchmark to emphasize harder tasks and more private held-out test data. Private, held-out test sets now make up 40% of the Index weighting, up from the 20% used in v4.1. The leaderboard order stays the same with Anthropic’s Claude Fable 5.1 first and OpenAI’s GPT-6 Astra second, while grading and several benchmarks are updated (with GPQA Diamond removed).

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