PydanticAI - ModRouter

Endpoint

https://api.modrouter.online/pydanticai

ModRouter’s PydanticAI router combines OpenAI, Anthropic, GenAI, Cohere, and Bedrock route families under the /pydanticai prefix.

OpenAI Provider

import os
from pydantic_ai import Agent
from pydantic_ai.models.openai import OpenAIModel
from pydantic_ai.providers.openai import OpenAIProvider

base_url = os.environ["MODROUTER_BASE_URL"].rstrip("/")
api_key = os.environ["MODROUTER_API_KEY"]

provider = OpenAIProvider(
    base_url=f"{base_url}/pydanticai/v1",
    api_key=api_key,
)

model = OpenAIModel("openai/gpt-4o-mini", provider=provider)
agent = Agent(model)

result = agent.run_sync("Hello")
print(result.output)

Anthropic Provider

Use the PydanticAI Anthropic provider with the base URL ending at /pydanticai if that provider appends /v1/messages internally:

base_url = f"{os.environ['MODROUTER_BASE_URL'].rstrip('/')}/pydanticai"

Notes

Match the provider class to the route shape: OpenAI provider to OpenAI paths, Anthropic provider to Anthropic paths, and so on.
ModRouter routes requests; PydanticAI tools and agent orchestration still run inside your application.
Use virtual keys for per-agent or per-environment governance.