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

# GPT-5 Codex

> OpenAI GPT-5 Codex — code-optimized version of GPT-5.

GPT-5 Codex is available through Starrise AI via OpenAI-compatible interface.

## Key Capabilities

* **OpenAI-compatible** — Drop-in replacement for the OpenAI SDK, no other code changes needed
* **Streaming** — Real-time token streaming via SSE
* **Tool calling** — Supports function calling and tool use
* **Flexible output** — Supports JSON mode and structured outputs

## Quick Example

<CodeGroup>
  ```bash cURL theme={null}
  curl https://ai.alad.com/v1/chat/completions \
    -H "Authorization: Bearer YOUR_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "model": "gpt-5-codex",
      "messages": [
        { "role": "user", "content": "Explain quantum entanglement in simple terms." }
      ]
    }'
  ```

  ```python Python theme={null}
  from openai import OpenAI

  client = OpenAI(
      api_key="YOUR_API_KEY",
      base_url="https://ai.alad.com/v1"
  )

  response = client.chat.completions.create(
      model="gpt-5-codex",
      messages=[
          {"role": "user", "content": "Explain quantum entanglement in simple terms."}
      ]
  )

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

  ```python Streaming theme={null}
  from openai import OpenAI

  client = OpenAI(
      api_key="YOUR_API_KEY",
      base_url="https://ai.alad.com/v1"
  )

  stream = client.chat.completions.create(
      model="gpt-5-codex",
      messages=[
          {"role": "user", "content": "Write a short poem about the ocean."}
      ],
      stream=True
  )

  for chunk in stream:
      print(chunk.choices[0].delta.content or "", end="")
  ```
</CodeGroup>

## Parameters

| Parameter         | Type           | Required | Description                               |
| ----------------- | -------------- | -------- | ----------------------------------------- |
| `model`           | string         | Yes      | Fixed value: `gpt-5-codex`                |
| `messages`        | array          | Yes      | Array of `{ role, content }` objects      |
| `max_tokens`      | integer        | No       | Maximum number of tokens to generate      |
| `temperature`     | float          | No       | `0`–`2`, controls randomness, default `1` |
| `stream`          | boolean        | No       | Enable SSE streaming, default `false`     |
| `top_p`           | float          | No       | Nucleus sampling threshold, default `1`   |
| `stop`            | string / array | No       | Sequences where generation stops          |
| `tools`           | array          | No       | List of tools the model can call          |
| `response_format` | object         | No       | Specify output format (e.g., JSON mode)   |

<Card title="API Reference" icon="code" href="/en/api-reference/model-api/openai/gpt-5-codex">
  View the interactive API Playground for GPT-5 Codex.
</Card>