Anthropic's Claude Opus 5.5 sits third overall, but Anthropic is second among labs

The latest reading of the deciding board puts Anthropic second among labs by its best entry. Arena's published leaderboard data, dated 28 October and read on 1 November, has Claude Opus 5.5 (High) third overall on style control at a score of 1509. Anthropic also holds fifth place with Claude Fable 5.1 (Max) at 1504. Google leads that table with Gemini 4 Carbon (High) at 1528 and Gemini 4 Argon (High) at 1520. Meta's Muse Wonder (Max) sits fourth at 1507, between the two Anthropic entries. On that reading Anthropic is behind Google and ahead of Meta, which makes second the current lab position, not third. That is why the forecast leans against Anthropic finishing third. For it to be third on 30 November, at 12:00 PM ET, it would have to slip behind another lab. The 28 October data does not show any lab ahead of it besides Google. An Arena post from 28 October, now several days old, reported Gemini 4 Carbon's debut at number one in Text Arena. A support page dated 30 October says Claude Haiku 5.5 has launched. That is a small model, and the evidence does not show it moving the text ranking. Anthropic's margin over Meta is three points on the best entries, and Arena scores can move as votes arrive. The thing to watch is Meta's Muse Wonder, or any new rival entry, overtaking Claude Opus 5.5 on the board.