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
$0.1/1M tokens
Output price
$0.6/1M tokens

Capabilities

vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch

Details

Model IDopenai/gpt-5.6-luna
Provider OpenRouter
Creator OpenAI
Familygpt-5.6
Licenseproprietary
Parameters—
Statusactive
Input modalitiesimage, text
Output modalitiestext
Architecture—
Knowledge cutoff
Training data cutoff—
Release date
Deprecation date—
Typechat
Reasoning tokensYes
Max input922K tokens
Open weightNo
Sourceofficial
Last updated

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$0.1
↓80%$0.5
Output
$0.6
↓80%$3
Cache write
—
Cache read
$0.01
↓80%$0.05
Batch in
—
Batch out
—
Price history · $/1M input
$1
$0.5
$0.1
Jul 10Jul 31Jul 31
DateInputOutputCache readChange
Jul 10, 2026$1$6$0.1—
Jul 31, 2026dbe2d73$0.5$3$0.05↓50%
Jul 31, 202639b8745$0.1$0.6$0.01↓80%

Input is ↓90% since Jul 10, 2026, from $1 to $0.1 per 1M tokens.

Price across providers

ProviderInputOutputSince launch
OpenRoutercheapest$0.1$0.6↓90%
Cursor$0.2$1.2—
OpenAI$0.2$1.2↓80%
Perplexity$0.2$1.2↓80%
Vercel AI Gateway$0.2$1.2↓80%

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$0.1$0.6
OpenAI: GPT-5.6 Luna1.1M128K$0.1$0.6
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 Terra Pro1.1M128K$1$6
OpenAI: GPT-5.6 Terra1.1M128K$1$6
OpenAI: GPT-5.6 Sol (batch)1.1M128K$2.5$15
OpenAI: GPT-5.6 Sol Pro (batch)1.1M128K$2.5$15
OpenAI: GPT-5.6 Sol Pro1.1M128K$5$30
OpenAI: GPT-5.6 Sol1.1M128K$5$30

API

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