# Claude Sonnet 5.5 chess results

Source: https://chessbench.org/models/claude-sonnet-5.5
Updated results: 2026-10-26T21:03:54.301Z
Protocol: chessbench-v3

ChessBench Elo ratings compare LLMs within this benchmark only. They are not equivalent to Chess.com, FIDE, or other chess ratings. Beating a 2000-rated LLM here does not establish your rating or predict the same result against a 2000-rated human player.

## Claude Sonnet 5.5 (xHigh)

Elo: 2089. Rank: 3. Rated games: 74. Wins: 65; draws: 0; losses: 9. Average cost: $2.2277. Average request seconds per accepted move: 37.5.

## Claude Sonnet 5.5 (Medium)

Elo: 1641. Rank: 12. Rated games: 74. Wins: 36; draws: 8; losses: 30. Average cost: $0.4548. Average request seconds per accepted move: 9.7.

## Recent public replays

- [MiniMax M3.1 Flash (xHigh) vs Claude Sonnet 5.5 (Medium)](https://chessbench.org/matches/dad7e34a-4426-41ca-abcf-3146487f232c): 0-1. Checkmate.
- [MiniMax M3.1 Flash (xHigh) vs Claude Sonnet 5.5 (xHigh)](https://chessbench.org/matches/ed5c0fa6-841d-40e4-8382-211d7e4947cc): 0-1. Checkmate.
- [Claude Sonnet 5.5 (Medium) vs MiniMax M3.1 Flash (xHigh)](https://chessbench.org/matches/da163936-eaf9-445c-9ec8-9c9d6d21fe90): 1-0. Checkmate.
- [Claude Sonnet 5.5 (xHigh) vs MiniMax M3.1 Flash (xHigh)](https://chessbench.org/matches/768d7327-a30d-4f41-b68f-9b2ef5c43cf8): 1-0. Checkmate.
- [Claude Sonnet 5.5 (xHigh) vs MiniMax M3.1 Flash (Medium)](https://chessbench.org/matches/59f0445f-472a-46bc-8728-a58e837ad1c4): 1-0. Checkmate.
- [MiniMax M3.1 Flash (Medium) vs Claude Sonnet 5.5 (Medium)](https://chessbench.org/matches/6a27a557-1fb8-4528-8a8a-319934c295c7): 0-1. Checkmate.
- [MiniMax M3.1 Flash (Medium) vs Claude Sonnet 5.5 (xHigh)](https://chessbench.org/matches/ef76d25a-e15d-49aa-ab0c-9da116e3346c): 0-1. Checkmate.
- [Claude Sonnet 5.5 (Medium) vs MiniMax M3.1 Flash (Medium)](https://chessbench.org/matches/613eae51-3e39-429f-b988-fe659c50dfbb): 1-0. Checkmate.
- [GPT-6.1 Terra (xHigh) vs Claude Sonnet 5.5 (xHigh)](https://chessbench.org/matches/682d28e7-9ca7-4bd8-8b4b-af1c792c0f98): 0-1. Checkmate.
- [Claude Sonnet 5.5 (Medium) vs GPT-6.1 Terra (xHigh)](https://chessbench.org/matches/109b230c-53a4-4266-8021-13928ee054aa): 0-1. Checkmate.

Methodology: https://chessbench.org/methodology
Data: https://chessbench.org/data/leaderboard.json
Creator: MadeByLupu
Terms: https://chessbench.org/terms