Chat Completions

建立對話補全回應。支援文本生成、多模態輸入、函式呼叫、串流回應等功能。

新專案建議使用 Responses API。 Responses API 將 instructions 與 input 分離，系統指令自動享有 Prompt Caching，快取命中率更高，可明顯降低成本與延遲。Chat Completions 仍會長期支援，既有整合無須遷移。

端點


POST https://api.ofox.io/v1/chat/completions

請求參數

參數	類型	必填	說明
`model`	string	✅	模型識別碼，如 `openai/gpt-6.1-sol`
`messages`	array	✅	訊息陣列
`temperature`	number	—	取樣溫度 0-2，預設 1
`max_tokens`	number	—	最大生成 token 數
`stream`	boolean	—	是否啟用串流回應
`top_p`	number	—	核取樣參數
`frequency_penalty`	number	—	頻率懲罰 -2 到 2
`presence_penalty`	number	—	存在懲罰 -2 到 2
`tools`	array	—	可用工具定義（Function Calling）
`tool_choice`	string/object	—	工具選擇策略
`response_format`	object	—	回應格式（JSON Mode）
`provider`	object	—	OfoxAI 擴充：路由和回退設定

Message 格式


interface Message {
  role: 'system' | 'user' | 'assistant' | 'tool'
  content: string | ContentPart[]  // 文字或多模態內容
  name?: string
  tool_calls?: ToolCall[]          // assistant 訊息的工具呼叫
  tool_call_id?: string            // tool 訊息的呼叫 ID
}
 
// 多模態內容
type ContentPart =
  | { type: 'text'; text: string }
  | { type: 'image_url'; image_url: { url: string; detail?: 'auto' | 'low' | 'high' } }

請求範例

cURL

Terminal


curl https://api.ofox.io/v1/chat/completions \
  -H "Authorization: Bearer $OFOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-6.1-sol",
    "messages": [
      {"role": "system", "content": "你是一個有幫助的助手。"},
      {"role": "user", "content": "解釋什麼是 API Gateway"}
    ],
    "temperature": 0.7
  }'

Python

chat.py


from openai import OpenAI
 
client = OpenAI(
    base_url="https://api.ofox.io/v1",
    api_key="<你的 OFOXAI_API_KEY>"
)
 
response = client.chat.completions.create(
    model="openai/gpt-6.1-sol",
    messages=[
        {"role": "system", "content": "你是一個有幫助的助手。"},
        {"role": "user", "content": "解釋什麼是 API Gateway"}
    ],
    temperature=0.7
)
 
print(response.choices[0].message.content)

TypeScript

chat.ts


import OpenAI from 'openai'
 
const client = new OpenAI({
  baseURL: 'https://api.ofox.io/v1',
  apiKey: '<你的 OFOXAI_API_KEY>'
})
 
const response = await client.chat.completions.create({
  model: 'openai/gpt-6.1-sol',
  messages: [
    { role: 'system', content: '你是一個有幫助的助手。' },
    { role: 'user', content: '解釋什麼是 API Gateway' }
  ],
  temperature: 0.7
})
 
console.log(response.choices[0].message.content)

回應格式


{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "created": 1703123456,
  "model": "openai/gpt-6.1-sol",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "API Gateway（API 閘道）是一個..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 25,
    "completion_tokens": 150,
    "total_tokens": 175
  }
}

串流回應

設定 stream: true 啟用 SSE 串流回應：

Python

stream.py


stream = client.chat.completions.create(
    model="openai/gpt-6.1-sol",
    messages=[{"role": "user", "content": "講一個故事"}],
    stream=True
)
 
for chunk in stream:
    content = chunk.choices[0].delta.content
    if content:
        print(content, end="", flush=True)

串流回應格式

每個 chunk 透過 SSE 發送：


data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":"你"},"finish_reason":null}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":"好"},"finish_reason":null}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}

data: [DONE]

多模態輸入（視覺）

發送圖片讓模型分析：


response = client.chat.completions.create(
    model="openai/gpt-6.1-sol",
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "這張圖片裡有什麼？"},
            {"type": "image_url", "image_url": {"url": "https://example.com/image.jpg"}}
        ]
    }]
)

支援視覺能力的模型包括：openai/gpt-6.1-sol、anthropic/claude-sonnet-5.5、google/gemini-3.8-flash 等。詳見視覺理解指南。

Function Calling

詳見函式呼叫指南。