GPT-5.6 Terra Pro API

GPT-5.6 Terra Pro is OpenAI’s GPT-5.6 Terra model run in pro reasoning mode for higher-quality responses on complex tasks.
Context
1.1M tokens
Input
$2.7508 / 1M
Output
$16.5048 / 1M
Released
Jul 9, 2026

How to use GPT-5.6 Terra Pro API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to openai/gpt-5.6-terra-pro.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "openai/gpt-5.6-terra-pro",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.6-terra-pro",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.6-terra-pro","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

GPT-5.6 Terra Pro API Pricing

TypePrice
Input
$2.7508 / 1M
Output
$16.5048 / 1M
Cached input
$0.27508 / 1M

Prompts with more than 272K input tokens are billed at 2x input and 1.5x output for the full request, and cache writes are billed at 1.25x the uncached input token rate.

GPT-5.6 Terra Pro vs other models

ModelInputOutputContextBest for
$2.7508 / 1M
$16.5048 / 1M
1.1M tokens
Agentic workflows and structured output
Free
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1M tokens
Coding + agentic reasoning
$0.82524 / 1M
$8.2524 / 1M
1.04M tokens
Reasoning + agents
$0.41262 / 1M
$3.4385 / 1M
1M tokens
Reasoning + agents

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