---
title: GPT-5.6 Terra | Runware Docs
url: https://runware.ai/docs/models/openai-gpt-5-6-terra
description: Balanced GPT-5.6 model for professional workloads that need strong reasoning with lower cost
---
# GPT-5.6 Terra

![GPT-5.6 Terra](https://assets.runware.ai/covers/openai-gpt-5-6-terra.jpg)

GPT-5.6 Terra is the balanced model in OpenAI's GPT-5.6 family, designed for production workloads that need strong reasoning without the cost of the flagship tier. It supports a 1,050,000 token context window, up to 128,000 output tokens, image input, structured outputs, function calling, and broad tool use, making it well suited to coding, analysis, extraction, workflow automation, and general-purpose professional assistants.

- **Status**: compatible-only
- **ID**: `openai-gpt-5-6-terra`
- **Context window**: 1M context
- **Max output**: 128K output
- **Creator**: OpenAI
- **Release Date**: July 9, 2026
- **Capabilities**: Text to Text, Image to Text, Checkpoint

**GPT-5.6 Terra** is served through Runware's **compatible endpoints**, which take another provider's request format. Point the SDK you already use at Runware by changing the base URL and the API key, and set `model` to `openai:gpt@5.6-terra`.

Requests and responses keep the provider's format, so **its reference documents every parameter**.

| Endpoint | Format |
| --- | --- |
| `/v1/chat/completions` | [OpenAI Chat Completions](https://runware.ai/docs/tools/compatible-apis#openai-chat-completions) |
| `/v1/responses` | [OpenAI Responses](https://runware.ai/docs/tools/compatible-apis#openai-responses) |

### [Chat Completions](https://runware.ai/docs/models/openai-gpt-5-6-terra#chat-completions)

**cURL**:

```bash
curl -X POST https://api.runware.ai/v1/chat/completions \
  -H "Authorization: Bearer $RUNWARE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai:gpt@5.6-terra",
    "messages": [{"role": "user", "content": "What is the capital of France?"}]
  }'
```

**Python**:

```python
from openai import OpenAI

client = OpenAI(
    api_key="your_runware_api_key",
    base_url="https://api.runware.ai/v1",
)

response = client.chat.completions.create(
    model="openai:gpt@5.6-terra",
    messages=[{"role": "user", "content": "What is the capital of France?"}],
)

print(response.choices[0].message.content)
```

**TypeScript**:

```typescript
import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: 'your_runware_api_key',
  baseURL: 'https://api.runware.ai/v1',
});

const response = await client.chat.completions.create({
  model: 'openai:gpt@5.6-terra',
  messages: [{ role: 'user', content: 'What is the capital of France?' }],
});

console.log(response.choices[0].message.content);
```

[Compatible APIs](https://runware.ai/docs/tools/compatible-apis#openai-chat-completions) covers streaming, tool calling and how the endpoint differs from OpenAI, and the [OpenAI API reference](https://platform.openai.com/docs/api-reference/chat/create) lists every parameter.

### [Responses](https://runware.ai/docs/models/openai-gpt-5-6-terra#responses)

**cURL**:

```bash
curl -X POST https://api.runware.ai/v1/responses \
  -H "Authorization: Bearer $RUNWARE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai:gpt@5.6-terra",
    "input": "What is the capital of France?"
  }'
```

**Python**:

```python
from openai import OpenAI

client = OpenAI(
    api_key="your_runware_api_key",
    base_url="https://api.runware.ai/v1",
)

response = client.responses.create(
    model="openai:gpt@5.6-terra",
    input="What is the capital of France?",
)

print(response.output_text)
```

**TypeScript**:

```typescript
import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: 'your_runware_api_key',
  baseURL: 'https://api.runware.ai/v1',
});

const response = await client.responses.create({
  model: 'openai:gpt@5.6-terra',
  input: 'What is the capital of France?',
});

console.log(response.output_text);
```

[Compatible APIs](https://runware.ai/docs/tools/compatible-apis#openai-responses) covers conversation state and function calls, and the [OpenAI API reference](https://platform.openai.com/docs/api-reference/responses/create) lists every parameter.

## Cost and speed

**Rates** (per 1M tokens)

- Input: `$2.00`
- Output: `$12.00`
- Cached input: `$0.20`

billed per token, so a request costs what the model produced · [How pricing works](https://runware.ai/docs/models-api/pricing)