About
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
Related Models
Pricing
Input
$2.50
per 1M tokens
Output
$15.00
per 1M tokens
Blended
$5.63
per 1M tokens
Cheaper than 10% of models. Median price is $0.61/1M tokens.
Cost Calculator
Tokens per day1M
100K100M
Daily
$5.63
Monthly
$168.75
vs. Similar Models
OpenAI: GPT-5.4
$5.630%
GPT-5.4 (low)
$5.630%
GPT-5.4 (Non-reasoning)
$5.630%
OpenAI: GPT-5.6 Terra
$5.630%
Performance
Context Window
1.1M
tokens
Larger than 96% of models
Max Output
128K
tokens
12% of context
Context Window Comparison
OpenAI: GPT-5.5
1.1MSame
OpenAI: GPT-5.4
1.1MSame
OpenAI GPT Latest
1.1MSame