GPT 5.6 Luna (Fast)
By openai
openai/gpt-5.6-luna-fastGPT-5.6 Luna is a fast, affordable GPT-5.6 model that brings strong capability at the lowest cost in the series.
ReleasedJul 9, 2026
Pricing
Pricing (Input)$0.40/M
Pricing (Output)$2.40/M
CachingYes
Limits
Context Length1.1M
Max Output Tokens128K
Input Modalities
TextSupported
ImageSupported
PDFSupported
AudioNot supported
Output Modalities
TextSupported
ImageNot supported
AudioNot supported
Features
ReasoningSupported
ToolsSupported
TemperatureSupported