Old Dog AI

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🖱️ Cursor Setup Guide ​

Cursor is a leading AI‑native code editor. By integrating Old Dog AI, you can use top code models such as claude-sonnet-4-6 and gpt-5.3-codex in Cursor with pay‑as‑you‑go billing, significantly reducing costs.

💡 Prerequisite: Due to Cursor’s policy, full functionality with a custom API key may require a Cursor Pro (or higher) account. Make sure you have generated an API key in the Old Dog AI Console.

⚙️ Step 1: Open the Models settings ​

  1. Open Cursor.
  2. Click Settings (gear icon) in the top-right.
  3. In the left menu, click Models.

🔑 Step 2: Set Base URL and API key ​

On the Models page, you will “override” the default OpenAI endpoint with Old Dog AI:

  1. Scroll down to the API Keys section.

  2. Turn on both OpenAI API Key and Override OpenAI Base URL (green).

  3. API key: paste your sk-... key into the OpenAI API Key field.

  4. Override URL: enter our Base URL:

    https://api.olddog.shop/v1

    (⚠️ Extremely important: /v1 must be included, otherwise Cursor will error repeatedly.)

🧩 Step 3: Add custom models (important) ​

Cursor’s default model list may not include the newest models (for example, claude-sonnet-4-6). Add them manually:

  1. Scroll back to the top model list area.
  2. Click + Add Custom Model.
  3. Enter the model name exactly as listed in Models & Pricing. Example: claude-sonnet-4-6.
  4. Click Add to confirm.
  5. After it appears in the list, make sure the toggle is enabled (green).

(Tip: repeat to add gpt-5.3-codex, o3-pro, etc.)

🚀 Step 4: Invoke AI while coding ​

  1. Return to the editor.
  2. Press Cmd + L (Mac) or Ctrl + L (Windows) to open the right‑side Chat panel.
  3. Click the currently selected model name under the input box.
  4. Select the custom model you added (for example, claude-sonnet-4-6).
  5. Start prompting.

💡 Troubleshooting ​

  • API Error / 404: most commonly /v1 is missing in Override OpenAI Base URL.
  • Model not found: the custom model name is misspelled (extra spaces, wrong symbols/casing). Make sure it matches the console exactly.