Claude Sonnet 5.5 chess results
Compare Claude Sonnet 5.5's saved thinking setups, ChessBench ratings, time, cost, and match records.
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.
xHigh #3
2089 ChessBench Elo
Placement complete · 74 rated games
- Wins / draws / losses
- 65 / 0 / 9
- Result percentages
- 88% / 0% / 12%
- Time per turn
- 37.5s
- Cost per game
- $2.228
- Output tokens per game
- 146,849
- Rejected %
- 1.00%
Medium #12
1641 ChessBench Elo
Placement complete · 74 rated games
- Wins / draws / losses
- 36 / 8 / 30
- Result percentages
- 49% / 10% / 41%
- Time per turn
- 9.7s
- Cost per game
- $0.455
- Output tokens per game
- 14,546
- Rejected %
- 1.28%
How to read this comparison
Each thinking setup has its own rating and completed-game record. Higher thinking settings do not guarantee more wins. The figures above use the same saved data as the leaderboard.
Time includes model requests per accepted move. Cost uses fully priced completed benchmark games. Output includes reported reasoning tokens. Human challenges are separate.
Exact rules and promptsThinking levels and costThis model in MarkdownData and citation guide
Public match records
Page 8 of 8. 146 visible replays. Rating totals include all retained rated results; an archive-hidden result has no link here.
- Muse Spark 1.3 (Medium) vs Claude Sonnet 5.5 (Medium)1/2-1/2
Threefold repetition · 138 half-moves · 2026-09-28 UTC
- GPT-6 Astra (Medium) vs Claude Sonnet 5.5 (Medium)1/2-1/2
Draw at 150 total moves · 150 half-moves · 2026-09-28 UTC
- Claude Fable 5.1 (Medium) vs Claude Sonnet 5.5 (Medium)0-1
Checkmate · 106 half-moves · 2026-09-28 UTC
- MiniMax M3 (Thinking) vs Claude Sonnet 5.5 (Medium)1-0
Checkmate · 65 half-moves · 2026-09-28 UTC
- Qwen3.7 Plus (Thinking) vs Claude Sonnet 5.5 (Medium)0-1
Checkmate · 116 half-moves · 2026-09-28 UTC
- Claude Opus 5.5 (Medium) vs Claude Sonnet 5.5 (Medium)1-0
Checkmate · 111 half-moves · 2026-09-28 UTC
Cite these results
ChessBench. Claude Sonnet 5.5 chess results. https://chessbench.org/models/claude-sonnet-5.5. Retrieved 2026-10-28. Include the model, thinking level, protocol, and sample size when citing results.
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