OpenAI

OpenAI

GPT-5.6 Terra

OpenAI's balanced GPT-5.6 tier, between the Sol flagship and the Luna cost tier. 1M context, accepts text, images and files.

Modalities

Text+Image → Text

Input

$3.38 /1M

Output

$20.25 /1M

Cached input

$0.34 /1M90% off

Context

1M

Speed

medium

Performance

Live production data from real requests on Kyma — not synthetic benchmarks.

Rank

#67

of 69 active models

Tokens served

28

all-time

Total requests2
Platform share0.0%

Pricing

Pay per token. Cached input is billed at 10% of the input rate.

$3.38 /1M input$20.25 /1M output
Hobby10 req/day · 2K in / 500 out
~$5.06/mo
Production1,000 req/day · 2K in / 500 out
~$506/mo
Scale20,000 req/day · 2K in / 500 out
~$10,125/mo
+ Estimate your workload
1,000
2,000
500
30%

Estimated monthly cost

$452

$15.05 / day on GPT-5.6 Terra

Same workload on:

GPT-OSS 120B$24.33-95%

Estimates use list pricing with cached input billed at the 90%-discount rate. Actual bills depend on real token counts — every response includes its exact cost.

How it compares

Against the peers people actually weigh it against.

SpecGPT-5.6 TerraGPT-OSS 120B
Input /1M$3.38$0.20
Output /1M$20.25$0.81
Context1M128K
ToolsYesYes
ReasoningYesNo
Speedmediummedium

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
      -H "Authorization: Bearer YOUR_API_KEY" \
      -H "Content-Type: application/json" \
      -d '{
        "model": "gpt-5.6-terra",
        "messages": [
          {"role": "user", "content": "Explain prompt caching in one paragraph."}
        ]
      }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

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

FAQ

Common questions about this model.

What is the context window of GPT-5.6 Terra?

GPT-5.6 Terra has a 1M-token context window — roughly 1544 pages of text in a single request.

How much does the GPT-5.6 Terra API cost?

$3.38 per 1M input tokens and $20.25 per 1M output tokens, with cached input at $0.34/1M — a 90% discount on repeated prompt prefixes. No subscription; you pay only for what you use.

Does GPT-5.6 Terra support function calling?

Yes — GPT-5.6 Terra supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

How do I use GPT-5.6 Terra?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to gpt-5.6-terra. Signing up is free and includes $0.50 of credit — no card required.

Start with $0.50 free credit — no card required.Create account →