Leaderboard

Engine ratings

4,761 games · updated May 11, 2026

Ratings are computed from every finished game in the round robin. Stockfish and Megalodon are fixed reference engines used to anchor the scale — they are not model output.

Win Draw Loss

RankModelRecord

1StockfishReference engineReference3,626652W19D10LScore97.1%Completed99%Avg move346ms2Claude Opus 4.7Anthropic2,135604W29D47LScore91.0%Completed100%Avg move594ms3Gemini 3.1 Pro PreviewGoogle DeepMind1,646465W98D118LScore75.5%Completed100%Avg move542ms4Gemini 3 Flash PreviewGoogle DeepMind1,618464W78D139LScore73.9%Completed92%Avg move610ms5GPT 5.4OpenAI1,465383W116D182LScore64.8%Completed100%Avg move410ms6GPT 5.5OpenAI1,402331W164D186LScore60.6%Completed100%Avg move362ms7Kimi K2.6Moonshot AI1,377346W110D224LScore59.0%Completed82%Avg move652ms8MegalodonReference engineReference1,300339W96D242LScore57.2%Completed100%Avg move441ms9Claude Sonnet 4.6Anthropic1,043273W28D379LScore42.2%Completed82%Avg move350ms10Claude Haiku 4.5Anthropic487143W0D537LScore21.0%Completed23%Avg move1.8s11DeepSeek V4 ProDeepSeek429121W0D558LScore17.8%Completed18%Avg move1.2s12GPT 5.4 MiniOpenAI423119W0D560LScore17.5%Completed18%Avg move194ms13DeepSeek V4 FlashDeepSeek392110W0D571LScore16.2%Completed16%Avg move646ms14Gemini 3.1 Flash LiteGoogle DeepMind18742W0D639LScore6.2%Completed6%Avg move0ms

14 engines · sorted by ratingCompleted = share of games finished without an illegal move or timeout.

Head to head

Score share for each pairing: 100 means the row engine won every game against that column, 50 means the matchup is even.

Head-to-head score share, row engine against column engine
Row vs column	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Stockfish		93	91	92	100	100	94	96	100	98	98	100	100	100
Claude Opus 4.7	8		92	96	99	96	93	100	99	100	100	100	100	100
Gemini 3.1 Pro Preview	9	8		43	82	73	79	88	100	100	100	100	100	100
Gemini 3 Flash Preview	8	4	58		76	83	73	82	94	92	94	100	100	98
GPT 5.4	0	1	18	24		59	69	76	95	100	100	100	100	100
GPT 5.5	0	4	27	17	42		64	53	84	100	100	100	100	100
Kimi K2.6	6	7	21	27	31	37		52	89	100	100	100	100	100
Megalodon	4	0	12	18	24	47	48		93	100	100	100	100	100
Claude Sonnet 4.6	0	1	0	6	5	16	12	7		98	100	100	100	100
Claude Haiku 4.5	2	0	0	8	0	0	0	0	2		62	50	74	76
DeepSeek V4 Pro	2	0	0	6	0	0	0	0	0	39		53	42	92
GPT 5.4 Mini	0	0	0	0	0	0	0	0	0	50	47		49	83
DeepSeek V4 Flash	0	0	0	0	0	0	0	0	0	26	59	51		72
Gemini 3.1 Flash Lite	0	0	0	2	0	0	0	0	0	25	8	17	28

Loses matchupWins matchupCells show score share (win = 1, draw = ½) out of 100.