OpenAI: GPT-5.6 Luna

proprietary

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series.

Intelligence
Reasoning
Speed
Context
1.1M
Max output
128K
Input price
$0.2/1M tokens
Output price
$1.2/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDopenai/gpt-5.6-luna
Provider OpenRouter
Creator OpenAI
Familygpt-5.6
Licenseproprietary
Statusactive
Typechat
Input modalitiesimage, text
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1.1M tokens
Max input922K tokens
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$0.2
Output
$1.2
Cache write
—
Cache read
$0.02
Batch in
—
Batch out
—

Family Comparison: gpt-5.6

ModelContextMax outPricing
OpenAI: GPT-5.6 Luna (batch)1.1M128K$0.1$0.6
OpenAI: GPT-5.6 Luna Pro (batch)1.1M128K$0.1$0.6
OpenAI: GPT-5.6 Luna Pro1.1M128K$0.2$1.2
OpenAI: GPT-5.6 Luna1.1M128K$0.2$1.2
OpenAI: GPT-5.6 Terra (batch)1.1M128K$1$6
OpenAI: GPT-5.6 Terra Pro (batch)1.1M128K$1$6
OpenAI: GPT-5.6 Sol (batch)1.1M128K$2$10
OpenAI: GPT-5.6 Sol Pro (batch)1.1M128K$2$10
OpenAI: GPT-5.6 Terra Pro1.1M128K$2$12
OpenAI: GPT-5.6 Terra1.1M128K$2$12
OpenAI: GPT-5.6 Sol Pro1.1M128K$4$20
OpenAI: GPT-5.6 Sol1.1M128K$4$20

API

GET/v1/models/openrouter/openai/gpt-5.6-luna

OpenAI: GPT-5.6 Luna

openai/gpt-5.6-luna

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series.

Changes · 5 entries
openai/gpt-5.6-lunacreateca7a400Nov 2, 2026, 03:02 AM
openai/gpt-5.6-lunaupdatee3d7dedAug 31, 2026, 04:13 AM
pricinginput$0.1→$0.2output$0.6→$1.2cached input$0.01→$0.02
openai/gpt-5.6-lunaupdate39b8745Jul 31, 2026, 06:11 AM
pricinginput$0.5→$0.1output$3→$0.6cached input$0.05→$0.01
openai/gpt-5.6-lunaupdatedbe2d73Jul 31, 2026, 06:07 AM
pricinginput$1→$0.5output$6→$3cached input$0.1→$0.05
openai/gpt-5.6-lunacreate105275dJul 10, 2026, 12:00 AM