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OpenAI

GPT-5.6 Terra API

GPT-5.6 Terra balances reasoning capability and cost for application workflows.

MODALITIES
TextText
Available
INPUT / OUTPUT80% OFF
$0.5/ 1M
/
$3/ 1M
USD per million tokens
CACHED INPUT
$0.05/ 1M
Platform price · USD
CONTEXT WINDOW
1,050,000tokens
Max output: 128,000 tokens

API Usage Examples

API documentation ↗
POSTGet API Key ↗
curl 'https://newrouters.com/v1/chat/completions' \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $MODEL_API_KEY" \
  --data '{
  "model": "gpt-5.6-terra",
  "messages": [
    {
      "role": "user",
      "content": "Explain how an HTTP request works in three concise steps."
    }
  ],
  "max_completion_tokens": 1024,
  "stream": false
}'

Set MODEL_API_KEY in your server environment. Requests use this model’s native API and your account pricing.

Docs: authentication and keys · Error handling

GPT-5.6 Terra pricing

Estimate one request, then choose a budget for your workflow.

UsageQuantityRateCost
tokens$0.5/ 1M$0.0005
tokens$0.05/ 1M$0
tokens$3/ 1M$0.0015
tokens$3/ 1M$0
Cost per request$0.002

Public USD estimate. Your account rate and final recorded usage determine the actual charge.

Model pricing details
SpecificationOur priceOfficial reference
Input · input ≤ 272,000$0.5 / 1M tokens$2.5 About 80% less than official
Input · input > 272,000$1 / 1M tokens$5 About 80% less than official
Cached input · input ≤ 272,000$0.05 / 1M tokens$0.25 About 80% less than official
Cached input · input > 272,000$0.1 / 1M tokens$0.5 About 80% less than official
Output · input ≤ 272,000$3 / 1M tokens$15 About 80% less than official
Output · input > 272,000$4.5 / 1M tokens$22.5 About 80% less than official
Reasoning · input ≤ 272,000$3 / 1M tokens$15 About 80% less than official
Reasoning · input > 272,000$4.5 / 1M tokens$22.5 About 80% less than official

GPT-5.6 Terra API · Examples

Original prompts adapted to documented capabilities; these are not vendor-generated outputs.

Official source ↗ · 2026-10-14

EXAMPLE PROMPT

Infer the failure chain from these logs. Separate observations from possible causes and propose a low-risk verification order. Logs: [paste redacted logs]

USER MESSAGE
01

Structured analysis

Tie diagnostic conclusions to log evidence and prioritize low-risk checks.

EXAMPLE PROMPT

Design a workflow for these business rules, listing state transitions, error paths and human handoffs. First identify missing information. Rules: [paste rules]

USER MESSAGE
02

Business workflow planning

Specify states, errors and human handoffs so the plan can become application logic.

What Is GPT-5.6 Terra?

GPT-5.6 Terra balances reasoning capability and cost for application workflows.

Official model information ↗ · 2026-10-14

GPT-5.6 Terra Platform specifications

SpecificationGPT-5.6 Terra
Model IDgpt-5.6-terra
ProviderOpenAI
API/v1/chat/completions · /v1/responses
Context window1,050,000 tokens
Maximum output128,000 tokens
Declared capabilitiesTools · Streaming · Reasoning · Structured output
Protocol & capability details

Protocol & capabilities

openai · gpt-5.6-terra

Context limit
1050000
Maximum output
128000

tools · stream · reasoning · structured_output

Compare GPT-5.6 Terra with related models

SpecificationGPT-5.6 Terragpt-5.4GPT-5.5
ProviderOpenAIOpenAIOpenAI
Input → outputTextTextTextTextTextText
Selection basisCurrent modelSame openai protocol · Same billing unitsSame openai protocol · Same billing units
Context / max output1,050,000 / 128,0001,050,000 / 128,0001,050,000 / 128,000
Starting price$0.5 / 1M tokens$0.5 / 1M tokens$1 / 1M tokens

Choose by the input types, output settings and billing unit your workflow needs. Try the same prompt across models to compare results for your own use case.

Integrate GPT-5.6 Terra into your app

Keep the native request format and point your application to the platform API. Prepare a key with model access, then review status and charges in your usage records.

View API examples

GPT-5.6 Terra API · Common Questions

Everything you need to know about API access, pricing and model capabilities.

How is GPT-5.6 Terra billed?

Charges depend on the recorded token usage and your account rates. Input, output and supported cache or reasoning categories are listed separately in the pricing table. The calculator uses public USD prices; the final usage receipt determines the charge.

How do I get an API key?

Choose “Get API access” to open the integration guide. Sign in to your NewRouters account, prepare a key with access to this model and copy an API example.

Which API endpoints can I use?

Supported endpoints: /v1/chat/completions、/v1/responses. Choose an endpoint in the API examples to see its native request format.

Does the model support streaming?

The current model route declares streaming support. Use the native endpoint’s streaming option and consume its events. Usage already completed may still be billed if the connection is interrupted.

Can I use tools or structured output?

Tools: supported. Structured output: supported. Request fields follow the selected native endpoint.

Where can I check usage and charges?

Keep the request ID and open your account’s LLM usage records to inspect request status, token counts and charges. Prompt and answer content are not a conversation history in this view.

Explore LLM Use Cases

All LLM models ↗

Integration topics / Documentation

All documentation ↗