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一個 API Key 呼叫 GPT、Claude、Gemini:5 分鐘設定教學
Crazyrouter Team · 2026-05-22 · via Crazyrouter Blog

一個 API Key 呼叫 GPT、Claude、Gemini:5 分鐘設定教學#

如果你正在台灣開發 AI 產品,常見情境可能是:一開始先接 OpenAI,後來想測 Claude 的長文理解,再測 Gemini 的速度或多模態能力。問題是,每多接一個供應商,就多一組 API key、一套 SDK、一種錯誤格式與一份維護成本。

比較實際的做法,是把模型供應商整合到同一個 OpenAI 相容 API gateway 後面。你的應用程式只需要記住一個 endpoint 和一個 API key,再透過 model 參數切換 GPT、Claude 或 Gemini。

這篇教學會用 Crazyrouter 示範一個簡單、可落地的設定方式。

適合什麼情境?#

這種做法特別適合:

  • 想在同一個產品流程中比較不同模型。
  • 已經使用 OpenAI SDK,但希望測試 Claude 或 Gemini。
  • 不想在後端管理多組供應商密鑰。
  • 希望之後加入 fallback model,提升穩定性。
  • 團隊想先快速驗證,再決定長期模型策略。

1. 建立 API Key#

先閱讀文件介紹,再照 quickstart 建立 API key:

在本機開發時,可以先放到環境變數:

正式環境請放在部署平台的 secret manager,不要寫死在程式碼,也不要放到前端。

2. 設定 OpenAI 相容 endpoint#

如果你使用 Node.js,先安裝 OpenAI SDK:

接著建立 client,重點是設定 baseURL

如果你原本的程式已經使用 OpenAI SDK,通常只需要改 API key 與 baseURL,不一定要大改架構。

3. 切換 GPT、Claude、Gemini#

接著可以用同一段 prompt 測不同模型:

這樣做的好處是,你可以用真實產品資料評估模型,而不是只看 benchmark。

4. Python 範例#

Python 的設定也很接近:

5. 上線前建議加上的保護#

正式接到產品流程前,建議至少加上這幾件事:

  1. Timeout:避免請求卡住太久。
  2. Retry with backoff:暫時性錯誤可以重試,但不要無限重試。
  3. Model logging:記錄模型名稱、延遲、錯誤與大致成本。
  4. Fallback:非關鍵流程可以準備備援模型。

例如:

下一步#

先挑一個低風險功能測試,例如摘要、分類、客服草稿、內部報表或搜尋 query rewrite。用相同 prompt 跑 GPT、Claude、Gemini,觀察品質、延遲與成本,再決定預設模型。

完整設定流程可以從 Crazyrouter quickstart 開始。