Claude Sonnet 5.5 takes third place on Code Arena’s WebDev leaderboard

Anthropic’s Claude Sonnet 5.5 has landed in third place on Arena.ai’s Code Arena WebDev leaderboard. Running with xHigh reasoning, it scored 1786 points. That would be a respectable result for any model. It stands out more for a mid-tier option sold at half the price of its bigger sibling, sitting a few points behind the flagships. How the leaderboard shakes out The top spot belongs to Claude Opus 5.5 Max, which scored approximately 1818 to 1820 points. In second is OpenAI’s GPT-6 Astra Max, at around 1792 points. Sonnet 5.5 trails the OpenAI model by roughly six points. At the very top of a crowded table, that is a narrow margin. The WebDev arena focuses on front-end web development. Models tackle tasks that demand complex, multi-step reasoning and the use of tools, mostly built with HTML and React. The work runs as multi-turn, agentic workflows. Models plan, build and revise across several steps instead of answering one prompt and calling it a day. Arena.ai builds the rankings from community votes. Users compare outputs from two models side by side and pick the one they prefer. As of late September 2026, the leaderboard had collected more than 800,000 votes across over 100 models...