OpenAI

OpenAI: GPT-5.6 Terra

stable

GPT-5.6 Terra is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

gpt-5.6-terragpt-terrareleased Jul 9, 2026
ProviderQuick start
Context
1.1M
tokens
Max output
128K
tokens
Input
$2.00
per 1M
Output
$12.00
per 1M

Activity

Daily period usage
Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M
Azure OpenAI
Azure OpenAI
1.1M$2.00$12.00
OpenAI
OpenAI
1.1M$2.00$12.00
OpenRouter
OpenRouter
1.1M$2.00$12.00

Pricing

ItemPriceUnit
Input$2.00per 1M tokens
Output$12.00per 1M tokens
Cache read$0.20per 1M tokens
Cache write$2.50per 1M tokens

Performance

Reliability

Compare

Compare usage and performance
Place this model beside up to three other catalog models.

Capabilities

Capabilities
Modalities
Input
Output
Details
Model ID
gpt-5.6-terra
Family
gpt-terra
Status
stable
Knowledge
Feb 16, 2026
Released
Jul 9, 2026
Gateway Config
API
2024-01-01
Auth
OPENAI_API_KEY
Discovery
static
Provider type
static

Quick Start

index.ts
import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@openai/gpt-5.6-terra",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL
https://api.openai.com/v1
Chat completions
https://api.openai.com/v1/chat/completions
Model
gpt-5.6-terra
Auth env
OPENAI_API_KEY

GPT-5.6 Terra FAQ

How much does the GPT-5.6 Terra API cost?

Through OpenAI, GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens.

What is the context window of GPT-5.6 Terra?

GPT-5.6 Terra accepts up to 1.1M tokens of context and returns up to 128K output tokens on OpenAI.

Which providers offer GPT-5.6 Terra?

GPT-5.6 Terra is available from Azure OpenAI, OpenAI and OpenRouter. Everstack can route between them with automatic fallback when one is unavailable.

What can GPT-5.6 Terra do?

GPT-5.6 Terra supports chat, function calling, image input and reasoning. It accepts text, image and PDF input.

How do I call GPT-5.6 Terra through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @openai/gpt-5.6-terra. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.