New AI Helper Claude Opus 5.5 Rated No. 1

Anthropic released Claude Opus 5.5 on September 22, 2026. The review site Artificial Analysis places its Adaptive Reasoning, Max Effort, Default Fallback version first among 206 AI systems, with a general ability score of 58. Built by Anthropic, it takes in words and pictures, writes text, works through problems, and remembers about a million pieces of text at once.