Artificial Analysis Intelligence Index v4.2

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Artificial Analysis has released version 4.2 of its Intelligence Index, aggregating ten challenging evaluations across mathematics, science, coding, and reasoning. Claude Fable 5.1 tops the benchmark with a score of 57, closely followed by GPT-6 Astra at 55.

Key points

  1. Combines ten distinct evaluations: AA-Briefcase, GDPval-AA v2, 𝜏³-Banking, Terminal-Bench v2.1, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, and AA-LCR v1.1.
  2. Claude Fable 5.1 (Adaptive Reasoning, Max Effort) leads with 57 points, ahead of GPT-6 Astra (max) with 55 points and GPT-6 Astra (xhigh) with 54 points.
  3. Tracks operational metrics alongside accuracy, including token usage (split into reasoning and answer tokens), weighted cost per task, and decode time.
  4. Includes concrete, multi-step scenarios such as Git SSH and Nginx deployments, banking policy tool calls, LaTeX market diagrams, and quantum physics computations.

Why it matters

Single-discipline benchmarks frequently fail to reflect real-world LLM utility. By synthesising practical systems administration, scientific programming, and business workflows, this composite metric offers a more comprehensive perspective on model intelligence, inference latency, and running costs.

Analysis

Artificial Analysis conducts independent evaluations while placing significant emphasis on operational trade-offs, particularly the relationship between reasoning tokens, execution speed, and token pricing. The narrow margin between the top models (54 to 57 points) highlights fierce competition among leading frontier models. Furthermore, tests like Terminal-Bench v2.1 and 𝜏³-Banking indicate an industry shift towards evaluating agentic tool invocation and multi-step execution rather than static knowledge recall.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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