OpenAI

GPT-5.6 Luna

GPT-5.6 Luna — fast, cost-efficient GPT-5.6 model for high-volume chat, classification, lightweight agentic workflows, multimodal inputs, and prompt caching.

gpt-5.6-luna

Pricing

~96%

Input: $0.007626 / 1,000,000 tokens
Output: $0.045756 / 1,000,000 tokens
Cache read: $0.000763 / 1,000,000 tokens
Cache write: $0.009532 / 1,000,000 tokens

How pricing works

Discount history

96.2%Nov 8, 03:56 AM UTC

Nov 7, 11:57 PMNov 8, 03:56 AM UTC

Model details

Input: text, image, file
Output: text
Context window: 1,050,000 tokens
Maximum output: 128,000 tokens
Availability: $8.2KUncapped capacity
Updated: 11/8/2026, 3:58:06 AM UTC

Capacity is reserved when your request is accepted.

Capabilities

ChatStreamingTool callingVisionReasoningFile inputWeb search

Supported parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools