Structured Outputs guarantees the model returns valid JSON matching your exact schema — no more parsing failures in production.

How to Use Structured Outputs

from pydantic import BaseModel

class MovieReview(BaseModel):
    title: str
    rating: int
    summary: str
    sentiment: Literal["positive", "negative", "neutral"]

response = client.beta.chat.completions.parse(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Review: This film was incredible..."}],
    response_format=MovieReview,
)
review = response.choices[0].message.parsed
print(review.rating)  # guaranteed integer

Reference:

Structured outputs documentation

https://en.wikipedia.org/wiki/Special:Search?search=Structured%20Outputs