gpt-5.6-terra· Released Jul 9, 2026

Name: gpt-5.6-terra
Brand: openai

openai/gpt-5.6-terra

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

Input

From$2.0625/M

Output

From$12.375/M

Context

Up to 1.1M

Max output

Up to 128K

Modalities

FileImageTextText

Input and output show the lowest price across upstreams, for reference. Your actual prices are listed per upstream below.

Upstreams & pricing

Upstream	Context	Max output	Input $/1M	Output $/1M	Cached input $/1M
Zenlayer AI Gateway-openai_compat (Global)From price	1.1M	128K	≤272K$2.0625 >272K$4.125	≤272K$12.375 >272K$18.5625	≤272K$0.20625 >272K$0.4125

Routed in real time — you pay the listed price of whichever upstream serves your call.

How to call

curlrequest.sh

curl https://api.tkex.ai/v1/chat/completions \
  -H "Authorization: Bearer $TX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-terra",
    "messages": [
      {"role": "user", "content": "Say hello in five words."}
    ]
  }'