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OpenRouter with LiteLLM

This sample shows how to use an OpenRouter-hosted model with ADK through the existing LiteLLM model connector.

Setup

Install ADK with optional integrations so that LiteLlm is available:

pip install "google-adk[extensions]"

Set your OpenRouter API key:

export OPENROUTER_API_KEY="..."

Optionally choose a model:

export OPENROUTER_MODEL="openrouter/openai/gpt-5.2"

Run the sample:

adk run contributing/samples/hello_world_openrouter

Notes

OpenRouter is used here through LiteLLM's OpenAI-compatible routing path:

LiteLlm(
    model="openrouter/openai/gpt-5.2",
    api_key=os.getenv("OPENROUTER_API_KEY"),
    api_base="https://openrouter.ai/api/v1",
)

For Gemini models routed through OpenRouter, use OpenRouter model IDs such as openrouter/google/gemini-2.5-pro:online. ADK's built-in Google tools are optimized for native Gemini model connections, so verify tool compatibility for the routed model and provider you select.