Epoch AI Research says Opus 5.5 narrowly leads GPT-6 Astra, while Sonnet 5.5 roughly matched Claude Fable 5.1.
Epoch AI Research says Claude Opus 5.5 took the top spot on its Epoch Capabilities Index with a score of 167, narrowly ahead of GPT-6 Astra. It also says Claude Sonnet 5.5 roughly matched Claude Fable 5.1, which scored 165.
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3 Sources, first seen ago
Many accounts praised Claude Opus 5.5 topping the Epoch Capabilities Index and the Sonnet 5.5 update as well-deserved progress, while others called the gains marginal or questioned the value of private benchmarks.
Based on 79 sentiment-bearing replies from 77 accounts across 2 conversations.
Many accounts praised Claude Opus 5.5 topping the Epoch Capabilities Index and the Sonnet 5.5 update as well-deserved progress, while others called the gains marginal or questioned the value of private benchmarks.
Based on 79 sentiment-bearing replies from 77 accounts across 2 conversations.
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