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Bring your own API keys to use custom models in Zo. Connect keys from OpenAI-compatible, Anthropic-compatible, or Groq endpoints.

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Quick start

  1. Go to Settings > Advanced
  2. Under Custom Models, fill in the form with your provider details
  3. Click + to save
  4. Click Test to verify the connection
  5. Select your custom model from the model picker in chat

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Supported formats

Zo uses streaming and tools, so make sure your provider and model have support for both.

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Configuration

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Examples

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OpenRouter

  • Base URL: https://openrouter.ai/api/v1
  • Format: OpenAI
  • Model ID: mistralai/ministral-14b-2512 or any OpenRouter model

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Anthropic

  • Base URL: https://api.anthropic.com
  • Format: Anthropic
  • Model ID: claude-haiku-4-5-20251001

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Groq

  • Format: Groq
  • Model ID: moonshotai/kimi-k2-instruct-0905

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Using custom models

After adding a custom model, it appears in the model picker in chat. Select it like any other model to use it for your conversations. Custom models don’t fall back to Zo’s built-in models if they fail — ensure your API key is valid and has sufficient credits.