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PydanticAI is an agent framework created by the Pydantic team to simplify building production-grade generative AI applications. It brings the ergonomic design philosophy of FastAPI to AI agent development, offering a familiar and type-safe approach to working with language models.

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Installing Libraries

pip install pydantic-ai
Set your Together AI API key: 
export TOGETHER_API_KEY=***

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Example

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

# Connect PydanticAI to LLMs on Together
model = OpenAIModel(
    "meta-llama/Llama-3.3-70B-Instruct-Turbo",
    provider=OpenAIProvider(
        base_url="https://api.together.ai/v1",
        api_key=os.environ.get("TOGETHER_API_KEY"),
    ),
)

# Setup the agent
agent = Agent(
    model,
    system_prompt="Be concise, reply with one sentence.",
)

result = agent.run_sync('Where does "hello world" come from?')
print(result.data)

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Output

The first known use of "hello, world" was in a 1974 textbook about the C programming language.

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Next Steps

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PydanticAI - Together AI Notebook

Learn more about building agents using PydanticAI with Together AI in our notebook.