OpenAI: GPT-5.6 Terra Pro
openai/gpt-5.6-terra-pro
ReasoningToolsJSONVision
Intelligence
—
Design Elo
—
Speed
164
26th fastest
Latency
3.1s
first token
Input price
$2.50
256th cheapest
Context
1.1M
128K max out
How it compares
Faster than92%
of all ranked models
Cheaper than16%
of all ranked models
Overview
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
Providers & pricing (5)
| Provider | In $/M | Out $/M | Context | Uptime |
|---|---|---|---|---|
| OpenAI | $2.50 | $15.00 | 1.1M | 83.1% |
| OpenAI | $1.25 | $7.50 | 1.1M | 83.1% |
| OpenAI | $5.00 | $30.00 | 1.1M | 83.1% |
| Azure | $2.50 | $15.00 | 1.1M | — |
| Azure | $2.75 | $16.50 | 1.1M | — |
Specifications
Context window1.1M
Max output128K
Knowledge cutoffFeb 2026
Input modalitiesfile, image, text
Output modalitiestext
Prompt caching—
Cache read price$0.250/M
ModeratedYes
GPT-5.6 Terra Pro FAQ
How much does GPT-5.6 Terra Pro cost?
GPT-5.6 Terra Pro costs $2.50 per million input tokens and $15.00 per million output tokens via OpenRouter, making it 256th cheapest of 306 paid models.
How fast is GPT-5.6 Terra Pro?
GPT-5.6 Terra Pro generates around 164 tokens per second with 3.1s time-to-first-token (p50), the 26th fastest tracked model.
What is GPT-5.6 Terra Pro's context window?
GPT-5.6 Terra Pro supports a 1.1M-token context window and can output up to 128K tokens. It accepts file, image, text input.
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