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OpenAI's GPT-6 Astra, released 3 September 2026, reached an Epoch Capabilities Index score of 167 as of September 2026 -- the highest score Epoch AI has recorded among the 251 models it tracks -- two points above Anthropic's Claude Fable 5.1 at 165 167, the highest Epoch Capabilities Index score on record
Verified 2026-09-24
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