---
title: GPT-6 Astra | Runware Docs
url: https://runware.ai/docs/models/openai-gpt-6-astra
description: Frontier reasoning and tool-use model for demanding end-to-end professional workflows
---
# GPT-6 Astra

![GPT-6 Astra](https://assets.runware.ai/covers/openai-gpt-6-astra.jpg)

GPT-6 Astra is OpenAI's frontier model for complex reasoning, coding, computer use, research, and document creation. It combines a 1,050,000-token context window with up to 128,000 output tokens, image understanding, structured outputs, function calling, and broad tool support. Configurable reasoning from low through max makes it well suited to long-running agent workflows that must plan, execute, and verify work across code, browsers, and professional software.

- **Status**: compatible-only
- **ID**: `openai-gpt-6-astra`
- **Context window**: 1M context
- **Max output**: 128K output
- **Creator**: OpenAI
- **Release Date**: September 18, 2026
- **Capabilities**: Text to Text, Image to Text, Checkpoint

**GPT-6 Astra** 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@6-astra`.

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-6-astra#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@6-astra",
    "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@6-astra",
    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@6-astra',
  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-6-astra#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@6-astra",
    "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@6-astra",
    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@6-astra',
  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)

*≤ 272K context*

- Input: `$10.00`
- Output: `$50.00`
- Cached input: `$1.00`
- Cache write: `$12.50`

*> 272K context*

- Input: `$20.00`
- Output: `$75.00`
- Cached input: `$2.00`
- Cache write: `$25.00`

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