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

# GPT-5 Codex High

> OpenAI GPT-5 Codex High — high-compute code generation version of GPT-5.

GPT-5 Codex High 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

```bash cURL theme={null}
curl https://dayu.cdn-fly.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5-codex-high",
    "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://dayu.cdn-fly.com/v1"
)

response = client.chat.completions.create(
    model="gpt-5-codex-high",
    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://dayu.cdn-fly.com/v1"
)

stream = client.chat.completions.create(
    model="gpt-5-codex-high",
    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="")
```

## Parameters

| Parameter | Type | Required | Description |
| - | - | - | - |
| `model` | string | Yes | Fixed value: `gpt-5-codex-high` |
| `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) |

> **[API Reference](/en/api-reference/model-api/openai/gpt-5-codex-high)**
>
> View the interactive API Playground for GPT-5 Codex High.


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