--- format: "aidr-story-markdown/v1" id: "6d41a8779a12982dbf7289cf1283819308fb374a7c5bbeb13a500ea1e7f16f17" canonical_url: "https://aidr.today/6d41a877?lang=en" title: "Claude Opus 5.5 Claims Top Spot on Epoch AI Index with 167 Score" lang: "en" requested_lang: "en" available_langs: ["en","vi"] translation_fallback: null fallback_fields: [] published_at: "2026-10-02T13:39:41.000Z" category: "Models" topics: ["anthropic","llm"] source_urls: ["https://marketbrief.now/ai/claude-opus-55-claims-top-spot-on-epoch-ai-index-with-167-score-cf82f2a4","https://huggingnews.com/ai/claude-opus-55-claims-top-spot-on-epoch-ai-index-with-167-score-cf82f2a4"] summary: "Anthropic's latest AI release has outperformed a competing model in an aggregated test of intelligence. Claude Opus 5.5 claimed first place on the Epoch Capabilities Index (ECI) with a score of 167, narrowly beating the GPT-6 Astra model from OpenAI. GPT-6 Astra retains a lead in mathematics with 170 points compared to 168 for Opus, but Opus leads in software engineering at 167 to 165. Anthropic's mid-size model, Claude Sonnet 5.5, roughly matched the score of 165 seen in the larger Claude Fable 5.1. Index data show Opus and Sonnet 5.5 lose <1 ECI point when moving from general tasks to software engineering, while Astra's score drops by about 2 points." --- # Claude Opus 5\.5 Claims Top Spot on Epoch AI Index with 167 Score > [Open the canonical story]() **Published:** 2026-10-02T13:39:41.000Z **Category:** Models **Topics:** anthropic, llm ## Summary Anthropic's latest AI release has outperformed a competing model in an aggregated test of intelligence\. Claude Opus 5\.5 claimed first place on the Epoch Capabilities Index \(ECI\) with a score of 167, narrowly beating the GPT\-6 Astra model from OpenAI\. GPT\-6 Astra retains a lead in mathematics with 170 points compared to 168 for Opus, but Opus leads in software engineering at 167 to 165\. Anthropic's mid\-size model, Claude Sonnet 5\.5, roughly matched the score of 165 seen in the larger Claude Fable 5\.1\. Index data show Opus and Sonnet 5\.5 lose <1 ECI point when moving from general tasks to software engineering, while Astra's score drops by about 2 points\. ## Sources - [Story source]() - [Story source]()