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GitHub Copilot / VS Code

This tutorial shows two ways to use LiteLLM Proxy from VS Code's chat. The LiteLLM extension adds your gateway as a language model provider, so the chat model picker lists the models your key can reach, with each model's price and a reasoning effort control. The Copilot proxy override instead points GitHub Copilot's own traffic at the proxy.

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The proxy override section is based on Sergio Pino's guide for calling GitHub Copilot models through LiteLLM Proxy.

Benefits of using VS Code chat with LiteLLM​

When you use VS Code chat with LiteLLM you get the following benefits:

Developer Benefits:

  • Universal Model Access: Use any LiteLLM supported model (Anthropic, OpenAI, Vertex AI, Bedrock, etc.) from the VS Code chat model picker.
  • Higher Rate Limits & Reliability: Load balance across multiple models and providers to avoid hitting individual provider limits, with fallbacks to ensure you get responses even if one provider fails.

Proxy Admin Benefits:

  • Centralized Management: Control access to all models through a single LiteLLM proxy instance without giving your developers API Keys to each provider.
  • Budget Controls: Set spending limits and track costs across all VS Code usage.

Prerequisites​

Before you begin, ensure you have:

  • A running LiteLLM Proxy instance
  • A valid LiteLLM Proxy API key
  • VS Code 1.115 or newer with the GitHub Copilot Chat extension (the chat view and model picker come from it)

Option 1: LiteLLM extension for VS Code​

The extension lives in the LiteLLM repository under vscode-extension/. It reads the gateway's GET /model_group/info for the key you configure, so the picker shows exactly the chat models that key can use, each with its input and output price per 1M tokens. Models whose gateway entry lists supported_reasoning_efforts get a Reasoning Effort menu in the chat toolbar, and the effort you pick is sent as reasoning_effort on every request to that model. Requests go to POST /v1/chat/completions as streaming chat completions with tools and images passed through, so routing, fallbacks, guardrails, and spend tracking all apply as usual.

Step 1: Build and install the extension​

git clone https://github.com/BerriAI/litellm.git
cd litellm/vscode-extension
npm ci
npm run package
code --install-extension litellm-vscode-0.1.0.vsix

Every push to main that touches the extension also builds a litellm-vscode artifact on the VS Code Extension workflow, which you can download and install the same way.

Step 2: Connect to your gateway​

  1. Run Chat: Manage Language Models from the Command Palette and pick LiteLLM
  2. Enter a name for the connection, the gateway URL (for example https://litellm.example.com), and a LiteLLM virtual key. The key is stored in VS Code's secret storage

The Language Models editor now lists the chat models that key can reach under the name you chose. Add LiteLLM again with another name to reach a second gateway or a second key.

Step 3: Pick a model and its reasoning effort​

Open the chat view and click the model name in the toolbar. The gateway's models are listed with their price per 1M tokens, and hovering a model shows its context limits and the reasoning efforts it supports. After picking a model that supports reasoning efforts, the toolbar shows a Reasoning Effort control whose choices are the efforts the gateway reports for that model plus Gateway default, which sends no reasoning_effort and lets the proxy's own default apply.

Keeping the list current​

Run LiteLLM: Refresh Models after the gateway's model list or pricing changes. To rotate the key of a connection, use the gear on its row in the Language Models editor and pick Update API Key; Delete removes the connection, and Open in Language Models (JSON) opens the entry to change its URL. If the stored key is ever lost, the editor shows a missing its API key row for that connection until you update the key.

Option 2: Route GitHub Copilot through LiteLLM​

This route keeps GitHub Copilot's own model picker and sends Copilot's traffic through the proxy instead. It needs a GitHub Copilot subscription (Individual, Business, or Enterprise) on top of the prerequisites above.

Step 1: Install LiteLLM​

Install LiteLLM with proxy support:

uv tool install litellm[proxy]

Step 2: Configure LiteLLM Proxy​

Create a config.yaml file with your model configurations:

config.yaml
model_list:
  - model_name: gpt-5.6-terra
    litellm_params:
      model: gpt-5.6-terra
      api_key: os.environ/OPENAI_API_KEY
  
  - model_name: claude-sonnet-5
    litellm_params:
      model: anthropic/claude-sonnet-5
      api_key: os.environ/ANTHROPIC_API_KEY

general_settings:
  master_key: os.environ/LITELLM_MASTER_KEY

Step 3: Start LiteLLM Proxy​

Start the proxy server:

litellm --config config.yaml --port 4000

Step 4: Configure GitHub Copilot​

Configure GitHub Copilot to use your LiteLLM proxy. Add the following to your VS Code settings.json:

{
  "github.copilot.advanced": {
    "debug.overrideProxyUrl": "http://localhost:4000",
    "debug.testOverrideProxyUrl": "http://localhost:4000"
  }
}

Step 5: Test the Integration​

Restart VS Code and test GitHub Copilot. Your requests will now be routed through LiteLLM Proxy, giving you access to LiteLLM's features like:

  • Request/response logging
  • Rate limiting
  • Cost tracking
  • Model routing and fallbacks

Advanced​

Use Anthropic, OpenAI, Bedrock, etc. models from VS Code​

Both options route to whatever the proxy config lists, so you can reach any provider by configuring different models in your LiteLLM Proxy config:

Route requests to Claude Sonnet:

config.yaml
model_list:
  - model_name: claude-sonnet-5
    litellm_params:
      model: anthropic/claude-sonnet-5
      api_key: os.environ/ANTHROPIC_API_KEY

general_settings:
  master_key: os.environ/LITELLM_MASTER_KEY

With this configuration, VS Code chat requests are routed through LiteLLM to your configured provider(s) with load balancing and fallbacks.

Troubleshooting​

If you encounter issues:

  1. No LiteLLM models in the picker: the picker only lists model groups whose mode is chat and that the configured key can access; check GET /model_group/info with that key, then run LiteLLM: Refresh Models. A window in Restricted Mode shows "Models unavailable" until you trust the workspace
  2. missing its API key row in the Language Models editor: the stored key was lost; use the gear on the connection's row and pick Update API Key
  3. GitHub Copilot not using proxy: Verify the proxy URL is correctly configured in VS Code settings and that LiteLLM proxy is running
  4. Authentication errors: Ensure your master key is valid and API keys for providers are correctly set
  5. Connection errors: Check that your LiteLLM Proxy is accessible at http://localhost:4000

Credits​

The proxy override route is based on the work by Sergio Pino from his original article: Calling GitHub Copilot models from OpenHands using LiteLLM Proxy. Thank you for the foundational work!

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