> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unifically.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GPT 6.1 Terra

> OpenAI's GPT 6.1 Terra language model. See supported inputs, parameters, pricing, response fields, and API examples.

GPT 6.1 Terra is OpenAI's mid-tier GPT-6.1 model and the upgrade to GPT 5.6 Terra, released on October 26, 2026. It is built for fast computer use, visual reasoning, and writing. It accepts text and image input, returns text, has a context window of about 1 million tokens with up to 128,000 output tokens, and supports `reasoning_effort` from `none` to `max`. With `none`, `temperature` and `top_p` are accepted.

Try it in the browser: [GPT 6.1 Terra API playground](https://unifically.com/models/gpt-6.1-terra).

## Model

```
openai/gpt-6.1-terra
```

| | |
| - | - |
| **Provider** | OpenAI |
| **Name** | GPT 6.1 Terra |

## Supported Endpoints

All three API formats are supported:

* [Chat Completions](https://docs.unifically.com/api-reference/v1-chat-completions.md) — `POST /v1/chat/completions`
* [Responses](https://docs.unifically.com/api-reference/v1-responses.md) — `POST /v1/responses`
* [Messages](https://docs.unifically.com/api-reference/v1-messages.md) — `POST /v1/messages`

## Example

```bash theme={null}
curl -X POST https://api.unifically.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "openai/gpt-6.1-terra",
    "messages": [
      {"role": "user", "content": "Read this invoice and return the vendor, date, and total as JSON."}
    ]
  }'
```

> [!NOTE]
>
> **Volume discounts** are available for almost all models. Reach out at [contact@unifically.com](mailto:contact@unifically.com) to discuss custom pricing.


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