Page 6 of 8~96 min topic

Structured outputs & JSON mode

Evaluate with evidence

Measure structured outputs with denominators, slices, and gates chosen before seeing results on the invoice extractor API.

~12 min this pageEvaluation

1Learn the idea

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Metrics

Track for structured outputs: parse rate, schema-valid rate, business-rule pass, retry count, p95 latency. Report fractions like 36/40, not vague quality adjectives. Segment by language, plan tier, document length, or other slices that matter for the invoice extractor API.

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Protocol

Freeze inputs and neighboring versions while evaluating structured outputs. Change one control. Pair results case by case on the invoice extractor API. Define hard gates (severe errors, privacy, latency) before the bake-off. Use deterministic checks where possible; humans for nuance; model judges only with calibration against gold.

Numeric reminder for structured outputs: if 970 of 1,000 outputs parse and 930 pass the schema, parse rate = 97% but end-to-end schema-valid rate = 93%; report both

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Make it operational

Resist adding a twelfth metric before the first three for structured outputs on the invoice extractor API have owners. This workload improves faster when a small scorecard is trusted than when a warehouse of unused plots exists.

Also pin one numeric memory from this structured outputs chapter: if 970 of 1,000 outputs parse and 930 pass the schema, parse rate = 97% but end-to-end schema-valid rate = 93%; report both That number is not decoration; it is a template for how claims about structured outputs on the invoice extractor API should look in design docs. Scoped specifically to structured outputs / invoice extractor API / evaluation.

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Common mix-ups

People confuse structured outputs with neighboring buzzwords when debugging the invoice extractor API. Before changing prompts, ask whether the broken stage was evidence gathering, the structured outputs judgment itself, validation, or the product action. Fixing the wrong stage creates folklore (“we tried structured outputs and it failed”) that blocks the next team on the invoice extractor API. Scoped specifically to structured outputs / invoice extractor API / evaluation.

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Rehearsal (structured-outputs/evaluation)

Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to structured outputs rather than generic AI advice.

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Rehearsal (structured-outputs/evaluation)

Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to structured outputs rather than generic AI advice.

Read

Rehearsal (structured-outputs/evaluation)

Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to structured outputs rather than generic AI advice.

Read

Rehearsal (structured-outputs/evaluation)

Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to structured outputs rather than generic AI advice.

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Before you start

Why this matters

A demo of the invoice extractor API looks great on three hand-picked examples of structured outputs. What does that demo refuse to tell you?

In the wild

See how this idea shows up as a product and a company — then come back to the lesson. Skills transfer across vendors.

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Page assessment

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1. What is one idea from this page you would apply, and what evidence would you check?

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