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OpenAI: GPT-5.6 Terra Pro.

multimodal closed 1.1M ctx
Cheapest input
$2.5/M
on OpenRouter
Cheapest output
$15.0/M
on OpenRouter
Hosted equiv.
~$5.4/hr
@ 100 tok/s on OpenRouter

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 OpenA

Hosted API only

No self-host path — closed weights.

OpenAI: GPT-5.6 Terra Pro's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenRouter api aggregator $2.5 $15.0 Launch ↗
FAQ

Frequently asked.

How do I run OpenAI: GPT-5.6 Terra Pro?
OpenAI: GPT-5.6 Terra Pro is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access OpenAI: GPT-5.6 Terra Pro?
OpenAI: GPT-5.6 Terra Pro is available via OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run OpenAI: GPT-5.6 Terra Pro?
API pricing starts at $2.5/M input tokens and $15.0/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is OpenAI: GPT-5.6 Terra Pro open-source or proprietary?
OpenAI: GPT-5.6 Terra Pro is a proprietary model from OpenAI. Access is API-only — there are no public weights to download.