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)
$0.10/1M
Output Price (Auto)
$0.60/1M
Cache Read (Auto)
$0.0100/1M
Capabilities
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
52.3
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Coding Index
71.4
Agentic Index
46.9
GPQA Diamond
Graduate-level scientific reasoning
91.1%
Better than 95% of models compared
HLE
Humanity's Last Exam
39.5%
Better than 94% of models compared
AA-LCR
Long context reasoning evaluation
78.3%
Better than 97% of models compared
GDPval-AA
Economically valuable tasks
54.1%
CritPt
Research-level physics reasoning
20.6%
SciCode
Python programming for scientific computing
52.5%
Better than 94% of models compared
AA-Omniscience Accuracy
Proportion of correctly answered questions
42.7%
AA-Omniscience Hallucination Rate
Rate of incorrect answers among non-correct responses
92.6%
Last updated Aug 8, 2026
Artificial Analysis