GPT-5.6 Terra API

OpenAI GPT-5.6 Terra: mid GPT-5.6 tier balancing quality and cost.

OpenAI·ChatAvailable

from$0.504/ 1M input tokens$0.5610% off

Model IDgpt-5.6-terra

reasoningtools1m-context

Input

Text

Output

Chat

Provider

8 providers

Last 7 days · not enough recent requests for stats yet.

GPT-5.6 Terra pricing

Prices are per unit; requests without a provider are routed to the cheapest provider that supports your parameters.

OptionPrice (USD)
All options
$3.024 / 1M output tokens
303 Credits$3.3610% off

Try GPT-5.6 Terra before you integrate

Test output quality, compare provider prices and estimate cost before writing any code.

Provider
Chat

Settings

PriceKIE AI
1M input tokens$0.504
1M output tokens$3.024

Credits for max_tokens are held first, then settled to the actual usage.

GPT-5.6 TerraAuto (cheapest)
GPT-5.6 Terra

Start a conversation. Replies stream in and are billed by actual token usage.

Enter to send · Shift + Enter for a new line

GPT-5.6 Terra prompt examples

Ready-to-use prompts. Load one into the playground and tweak it.

Source
Scene

21 prompts

Summarize this implementation plan in one paragraph for a non-technical stakeholder, then list the three main operational risks. <paste plan here>

Draft a friendly reply to a customer whose export keeps timing out. Ask for the file size and browser, and offer a workaround.

Document Q&A

Analysis

Using only the policy document below, answer: can contractors expense home internet? Quote the relevant section. <paste document here>

GPT-5.6 Terra API reference

Endpoints, request fields and runnable examples for this model.

Base URL

https://01router.com/api/v1
llms.txt

Quick start

Set API_KEY to your project key, then run a sample from your server. Replace example media URLs with your own public URLs.

Auto-routing chooses a provider that supports the request. Select a provider to see its input constraints and pinned request examples.

curl https://01router.com/api/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": false
  }'

Endpoints

Only endpoints relevant to this model are listed. Paths below include /api/v1. Click an endpoint to read its usage.

Authentication

Send your API key as a Bearer token. Requests are billed to the key owner's credits.

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
Get an API key

Input

Send messages directly in the request body. Chat requests do not use an input wrapper.

Request body

NameTypeRequiredDescription
modelstringYes"gpt-5.6-terra"
providerstringNoPin a provider; omit to auto-route to the cheapest. One of: replicate | wavespeed | kie | apimart | evolink | atlascloud | vercel | openrouter
messagesobject[]YesOpenAI-format messages, each with role and content.
streambooleanNotrue returns an SSE stream.
max_tokensintegerNoOutput token cap; credits are pre-held for it (default 4096).

Output

This example uses stream: false. Read the reply from choices[0].message.content. With stream: true, read SSE chunks from choices[].delta until [DONE].

Task completed

{
  "id": "chatcmpl-example",
  "object": "chat.completion",
  "model": "gpt-5.6-terra",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 8,
    "total_tokens": 17
  }
}

Response fields

NameTypeRequiredDescription
idstringYesChat completion ID
objectstringYeschat.completion
modelstringYesgpt-5.6-terra
choicesobject[]YesReply choices; message.content contains the non-streaming response.
usageobjectNoToken usage: prompt_tokens, completion_tokens and total_tokens. Availability depends on the provider.

Model schema

This public endpoint returns the model parameters and each provider’s supported constraints and prices.

curl "https://01router.com/api/v1/models/gpt-5.6-terra"

Errors

Check the HTTP status and error.message. Fix the request before retrying validation or authentication errors. A failed generation is reported in status and error on the task itself.

{
  "error": {
    "message": "Invalid or missing API key",
    "code": "unauthorized"
  }
}

400Invalid body or parameter value

401Missing or invalid API key

402Not enough credits

404Unknown model or generation

429Too many requests — retry after the given seconds

502Every provider rejected the task (credits refunded)

Auth, routing, billing and error codes are covered in →

Use with AI

Give your coding assistant this model reference: endpoints, input constraints, output fields and request examples in plain text.

Open llms.txt

How does GPT-5.6 Terra compare?

Specs and starting prices side by side. Test with the same prompt before you choose.

GPT-5.6 TerraGPT-6 AstraGPT-6 SolGPT-6 Luna
VendorOpenAIOpenAIOpenAIOpenAI
Starting price$0.504 / 1M input tokens$2.52 / 1M input tokens$0.54 / 1M input tokens$0.027 / 1M input tokens
InputTextTextTextText
Provider8 providers7 providers7 providers8 providers

GPT-5.6 Terra API FAQ

Why is GPT-5.6 Terra the default choice?

Terra sits between Sol and Luna and covers most production work at a moderate price: app features, internal tools, support automation, routine agent steps, code review and document Q&A.

When should I move up to Sol?

Log the prompts where Terra falls short, re-run them on GPT-5.6 Sol, and route only that class of request to Sol.

What are the limits?

The same as Sol: about 1.05M tokens of context, up to 128K output tokens, text and image input, tools and structured output.

Is it OpenAI-compatible?

Yes. Call it through our /chat/completions endpoint with the OpenAI SDK by changing the base URL and model name.

How is it billed on 01router?

Per 1M input and output tokens, settled from actual usage. See the pricing table for current rates.

Related models

Other models you can call with the same API key.