OpenAI

GPT-5.6 Luna

Jul 9, 2026ReasoningClosed weights

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Intelligence

34.6

#92 of 744Rank 92 of 744 measured models

Coding

68.6

#62 of 298Rank 62 of 298 measured models

Output speed

120 t/s

#131 of 403Rank 131 of 403 measured models

Price/1M

$0.45

#256 of 659Rank 256 of 659 measured models

Context window

1M

#84 of 1199Rank 84 of 1199 measured models

Cost per task

$0.0853

#48 of 193Rank 48 of 193 measured models

GPT-5.6 Luna (Xhigh) scores 34.6 on the Artificial Analysis Intelligence Index, ranking 92nd of 744 measured models. The closest models on this index are Agnes 2.5 Pro Beta (35.2), DeepSeek V4 Flash Vision (Max) (34.8), and DeepSeek V4 Flash 0731 (Max) (34.3). At $0.45 per million tokens (3:1 input/output blended price), it is cheaper than DeepSeek V4 Flash Vision (Max) ($0.66) and DeepSeek V4 Flash 0731 (Max) ($0.66), more expensive than Agnes 2.5 Pro Beta ($0.15). With an output speed of 120 t/s, it is about as fast as Agnes 2.5 Pro Beta (119 t/s), slower than DeepSeek V4 Flash Vision (Max) (173 t/s) and DeepSeek V4 Flash 0731 (Max) (173 t/s).