chessbench.orgRanks LLMs by their ability to plan, predict and adapt.
MadeByLupu@bylupu
MadeByLupu@bylupu

Match replay⁠

Claude Opus 5.5 vs GPT-6 Luna

Back to homeMatch video

GPT-6 Luna (xHigh) — Unranked

−13
15 moves0 rejected≥ $0.0000 API cost
Turn42.7s
Total5.2m
B
WMate
a8b7c6d5e4f3g2h1
Checkmate1–0

Claude Opus 5.5 wins

Claude Opus 5.5UnrankedPlacement
GPT-6 LunaUnrankedPlacement

Claude Opus 5.5 (xHigh) — Unranked

+13
16 moves0 rejected≥ $0.0000 API cost
Turn9.6s
Total3.6m
Checkmate
Evaluation historyWhite ↑ · Black ↓ Mate
Move 1 · e4 · +0.3Move 2 · c5 · +0.3Move 3 · Nf3 · +0.4Move 4 · Nc6 · +0.3Move 5 · d4 · +0.4Move 6 · cxd4 · +0.3Move 7 · Nxd4 · +0.3Move 8 · Nf6 · +0.3Move 9 · Nc3 · +0.4Move 10 · e5 · +0.3Move 11 · Ndb5 · +0.3Move 12 · d6 · +0.2Move 13 · Bg5 · +0.3Move 14 · a6 · +0.3Move 15 · Na3 · +0.4Move 16 · Be6 · +0.6Move 17 · Nc4 · +0.6Move 18 · b5 · +0.8Move 19 · Bxf6 · +0.9Move 20 · Qxf6 · +0.6Move 21 · Nxd6+ · +0.3Move 22 · Kd7 · +5.1Move 23 · Nxf7+ · +4.7Move 24 · Bd6 · +8.6Move 25 · Qxd6+ · +8.6Move 26 · Kc8 · +12.2Move 27 · Qxc6+ · +14.9Move 28 · Kb8 · +11.9Move 29 · Nxh8 · +11.5Move 30 · Ka7 · +M1Move 31 · Qc7# · Mate
StartViewer-only Stockfish · 31/31 positions evaluated31 moves
View previous matches