langchain-structured-outputs.py

from langchain_openai import ChatOpenAI
from langchain_core.pydantic_v1 import BaseModel, Field
from dotenv import load_dotenv


load_dotenv()


class NextMove(BaseModel):
    move: str = Field(..., description="Best next move to win the chess game. It should be in Standard Algebraic Notation")
    reasoning: str = Field(..., description="Reasoning explaining why the move is the best")


model = ChatOpenAI()
model_with_structure = model.with_structured_output(NextMove)

print(model_with_structure.invoke("Generate a chess move"))