OpenAI
GPT-5.6 Luna None
Released 2026-07-09 · Data snapshot 2026-10-26
Overall score
42.9
Awaiting benchmarks (insufficient coverage)Benchmark coverage
15.4%
4 third-party benchmarks
Context window
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tokens
Input price
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per million tokens
Output price
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per million tokens
Dimension performance
Reasoning
42.9
Above averageBelow averageAnchored at 50 (reference models’ average); every 15 points ≈ one standard deviation
Benchmark details
Reasoning3 items
FrontierMath (Tiers 1-3)39.6
Mystery Game Puzzles20
Chess Puzzles3
Knowledge1 items
GPQA Diamond63.6
Multiple reasoning tiers of the same benchmark take the best value; raw scores have different scales and are not comparable across benchmarks.