openai
OpenAI: GPT-5.6 Terra Pro
openai/gpt-5.6-terra-pro
For $1, you can send approximately:
~8.16messages
How do we get this number?
One message = ~7,000 input tokens + ~7,000 output tokens
Input cost per message7,000 x $2.50/M = $0.017500
Output cost per message7,000 x $15.00/M = $0.105000
Total cost per message$0.122500
Messages for $18.16
Context window
1.1M
tokens
Max response
128k
tokens
Input price
$2.50
per million tokens
Output price
$15.00
per million tokens
Modalities
Input:fileInput:imageInput:textOutput:text
Description
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode