GPT-5.6 Luna with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128.0K
Input Price (Auto)
$0.10/1M
Output Price (Auto)
$0.60/1M
Cache Read (Auto)
$0.0100/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
52.3
Coding Index
71.4
Reasoning
GPQA Diamond
Graduate-level scientific reasoning
91.1%
Better than 94% of models compared
HLE
Humanity's Last Exam
39.5%
Better than 93% of models compared
AA-LCR
Long context reasoning evaluation
78.3%
Better than 96% of models compared
Coding
SciCode
Python programming for scientific computing
52.5%
Better than 94% of models compared
Last updated Aug 16, 2026
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