Claude Fable 5.2 Scores 65 Achieves Highest AI Analysis Score Yet
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| Source: HN | Original article
Claude Fable 5.2 achieves a score of 65 on the Artificial Analysis Intelligence Index, the highest recorded to date.
Anthropic’s Claude Fable 5.2 has not only topped the Artificial Analysis Intelligence Index with a score of 65, it also outperformed OpenAI’s latest GPT‑6 Astra and Anthropic’s own Fable 5.1 in the same run, cementing its lead at the frontier end of the leaderboard. The result, released on 9 November 2026, places the model well above the category median of 40 and ahead of Anthropic’s Opus 5.5, which scored 59, while Meta’s Muse Ember fell behind the top tier.
The benchmark, version 5.0.1 of the Artificial Analysis suite, measures reasoning ability, token efficiency and multimodal handling. Fable 5.2, a reasoning‑focused model with a 1 million‑token context window, accepts text and image inputs and returns text output. In the test it generated 275 million tokens, a volume far exceeding the median of 72.8 million, underscoring its verbosity and depth of processing. Both GPT‑6 Astra and Fable 5.1 recorded lower scores and token outputs, while Muse Ember failed to stay within the top‑ranked cohort.
Why it matters: the score signals Anthropic’s continued lead in large‑context, multimodal reasoning, a segment increasingly important for enterprise AI workloads. By making Fable 5.2 available on every paid plan and through the API (claude‑fable‑5‑2), Anthropic is positioning the model for broad adoption, potentially reshaping pricing and performance expectations across the market.
What to watch next: further rounds of the Artificial Analysis benchmark will reveal whether competitors can close the gap, while Anthropic’s parallel release of Claude Mythos 5.2 – currently limited to Cyber and Life Sciences verification programs – may extend the company’s foothold in specialized sectors. Observers will also track how the model’s high token output translates into real‑world cost and latency for customers, and whether Anthropic adjusts pricing or introduces new safeguards in response to the heightened capabilities.
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