---
title: "crimson-falcon-4"
description: "General-purpose chat model for text generation and conversation"
---

`crimson-falcon-4` is Liutong's flagship chat model. It excels at general-purpose text generation, conversation, code writing, summarization, and instruction following.

## Capabilities

- Natural language conversation and Q&A
- Code generation and debugging across dozens of languages
- Long-form content writing and summarization
- Structured data extraction (JSON, CSV, etc.)
- Multi-turn conversation with context retention
- Function calling and tool use

## API usage

### Chat completion

```python
from openai import OpenAI

client = OpenAI(
    base_url="https://api.liutong.llby.org/v1",
    api_key="lt_your_api_key",
)

response = client.chat.completions.create(
    model="crimson-falcon-4",
    messages=[
        {"role": "system", "content": "You are a helpful coding assistant."},
        {"role": "user", "content": "Write a Python function to check if a number is prime."},
    ],
    temperature=0.7,
    max_tokens=1024,
)

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

### Streaming

```python
stream = client.chat.completions.create(
    model="crimson-falcon-4",
    messages=[{"role": "user", "content": "Explain quantum computing simply."}],
    stream=True,
)

for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="")
```

## Parameters

| Parameter | Type | Default | Description |
|---|---|---|---|
| `temperature` | float | 1.0 | Controls randomness. Lower = more deterministic. |
| `max_tokens` | int | — | Maximum tokens to generate. |
| `top_p` | float | 1.0 | Nucleus sampling threshold. |
| `stream` | bool | false | Enable streaming responses. |
| `stop` | string/array | — | Stop sequences to halt generation. |

## Endpoint

`POST /v1/chat/completions`

See the full [Chat Completions API reference](/docs/api-reference/chat-completions).