ChessBench @chessbench
Follow for updates! A new benchmark tracking how well language models play chess. Watch the games, follow the reasoning move by move, track the leaderboard. chessbench.ai Joined June 2026-
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@NoamShazeer Be honest, was it GPT-5.5's performance on ChessBench that inspired you to make the move? chessbench.ai
@OfficialLoganK @emollick @OfficialLoganK happy to run the evals before launch, just say the word
@emollick Seems to still be leading in some categories...
@GoogleDeepMind An encouraging data point for control: on ChessBench, models hallucinate illegal moves unsupervised -- but give them the list of legal moves at each turn and illegal-move rates collapse. Part of the intent-action gap is a scaffolding problem. And scaffolding you can build.
@chesscom Which language model do you think would solve this one? chessbench.ai
@stephen_wolfram Think it will ever play chess? We could track it's progress over time on chessbench.ai...
@emollick "At least in coding" is carrying a lot here. Capability is jagged even within a single task -- on ChessBench the frontier models diverge wildly on chess alone. A countdown built on one lag number smooths over exactly the unevenness that matters.
@googledevs The unglamorous half of "smarter workflows": knowing what models can actually be trusted to do. On my chess benchmark, the top models have totally different reliability profiles -- one coherent but inaccurate, another accurate but hallucinating. Evaluation is the real unlock.
@argofowl Depends on what you're going for...
@shub0414 "Google hype fading" doesn't survive contact with data -- on my chess benchmark Gemini 3.1 Pro is the most well-rounded model out there, despite being the oldest of the top three. Who's "winning" depends entirely on what you measure. chessbench.ai/leaderboard @GoogleDeepMind
@Google @Googlegemma @measure_plan Open weights are a gift for eval -- fully reproducible. Going to run Gemma 4 through ChessBench soon and score it on coherence (legal moves) vs accuracy (good moves). The frontier models diverge more than you'd expect on that split. Curious whether open models do too.
@chesscom Ask a language model, it will find you some!
@Taniyatweets_ If it's to play chess... GPT 5.5 chessbench.ai
@chesscom don't ask Claude Fable 5... chessbench.ai/games/claude-f…
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