Anthropic’s Claude Opus 5.5 tops AI index with 61.7 score

Anthropic / Wikimedia Commons (Public domain) Artificial Analysis has released its Coding Agent Index v2.0, showcasing the performance of AI models across 290 software tasks. The update highlights Anthropic’s Claude Opus 5.5 as the leader, scoring 61.7 overall and dominating the FrontierCode benchmark. This development follows the replacement of DeepSWE with Cognition’s private benchmark, FrontierCode v1.1, and revisions to the SWE-Atlas-QnA grading criteria. The updated index evaluates performance on real-world code mergeability, providing a comprehensive assessment of modern AI capabilities. Key Takeaways The announcement suggests that Anthropic’s Claude Opus 5.5 is currently leading in AI model rankings according to the new index. Markets appear to reflect mixed reactions, as the source’s social media origin reduces perceived impact strength. Pricing suggests a decrease in confidence for Anthropic maintaining its top position by the end of October 2026. What to Watch Observers will be monitoring further announcements from Anthropic and competitors, such as Google and Meta, which could influence market confidence. Key indicators would include any new benchmark results or model re...