Artificial Analysis launches Intelligence Index v4.2; GPT-6 Astra most token-efficient
ArtificialAnlys · x · 2026-09-05
Artificial Analysis announced Intelligence Index v4.2, accelerating parts of the planned v5 release to keep pace with the frontier. The new version has more complex, realistic tasks and more private test sets to prevent gaming, adding AA-Briefcase (a private agentic knowledge-work eval) and @HelloSurgeAI's GDP.pdf among others.
On token efficiency, GPT-6 Astra is more token-efficient than almost every other model near the intelligence frontier, while Claude Fable 5.1 and Gemini 3.8 Flash use the most tokens among models scoring at least 25 on the Index.
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