Private AI
GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume chat, classification, lightweight agentic workflows, and latency-sensitive reasoning tasks.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128.0K
Input Price (Auto)
$1.00/1M
Output Price (Auto)
$6.00/1M
Cache Read (Auto)
$0.10/1M
Capabilities
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
34.0
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Coding Index
52.3
GPQA Diamond
Graduate-level scientific reasoning
74.6%
Better than 61% of models compared
HLE
Humanity's Last Exam
11.0%
Better than 66% of models compared
AA-LCR
Long context reasoning evaluation
50.0%
Better than 59% of models compared
SciCode
Python programming for scientific computing
44.6%
Better than 85% of models compared
Last updated Jul 9, 2026
Artificial Analysis