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Using PydanticAI

PydanticAI provides a high-level interface for working with various LLM providers, including OpenRouter.

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Installation

pip install 'pydantic-ai-slim[openai]'

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Configuration

You can use OpenRouter with PydanticAI through its OpenAI-compatible interface: 
from pydantic_ai import Agent
from pydantic_ai.models.openai import OpenAIModel

model = OpenAIModel(
    "anthropic/claude-sonnet-4.6",  # or any other OpenRouter model
    base_url="https://openrouter.ai/api/v1",
    api_key="sk-or-...",
)

agent = Agent(model)
result = await agent.run("What is the meaning of life?")
print(result)
For more details about using PydanticAI with OpenRouter, see the PydanticAI documentation.