OpenAI: GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks.

Context
1.1M
Max output
128K
Input price
$2/1M tokens
Output price
$12/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode

Details

Model IDopenai/gpt-5.6-terra-pro
Provider OpenRouter
Creator OpenAI
Familygpt-5.6
License—
Status—
Typechat
Input modalitiesimage, text
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window1.1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$2
Output
$12
Cache write
—
Cache read
$0.2
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-terra-pro