Nested and Recursive Schemas: The Depth Limit Nobody Documents
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There are two ceilings on schema depth and they behave completely differently. One is published, enforced at request time and easy to discover. The other is not a limit at all — it is a gradual change in what a failure looks like, and it has no error message. Two different limits The hard limit is a documented cap in the provider implementation. OpenAI’s Structured Outputs guide has published caps on nesting depth, on total object properties across a schema, and on the combined character length…
1Key Takeaways
- There are two ceilings on schema depth and they behave completely differently.
- One is published, enforced at request time and easy to discover.
- The other is not a limit at all — it is a gradual change in what a failure looks like, and it has no error message.
- Two different limits The hard limit is a documented cap in the provider implementation.
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that there are two ceilings on schema depth and they behave completely differently.
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