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- 1Claude Opus 5.5 Tops Epoch AI Index Ahead of GPT-6●Claude Opus 5.5 Tops Epoch AI Capabilities Index Ahead of OpenAI's GPT-6
Anthropic's Claude Opus 5.5 has taken the top spot on Epoch AI's capabilities index, edging out OpenAI's GPT-6. The ranking, which benchmarks frontier models across reasoning, coding and other capability measures, marks a notable shift in the AI race, with commentators debating what the lead means for OpenAI's competitive position.