GPT-5.6 Luna
OpenAI
openai/gpt-5.6-lunaGPT-5.6 Luna is the fast, low-cost tier of OpenAI's GPT-5.6 family, tuned for high-volume, latency-sensitive work like chat, classification, and lightweight agents while retaining genuine GPT-5.6 reasoning.
Cost rate
0.2x
Context
1.1M
Released
Jul 9, 2026
Input
FileImageText
Output
Text
Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.
Document analysis
#19 · top 49%
Business, Management, & Finance
#34 · top 9%
Mathematical
#37 · top 10%
Image understanding
#40 · top 27%
Performance
Median latency and throughput measured across recent requests.
Throughput144 tok/s
Latency