Which JSON Schema keywords a Sume Format output_schema accepts
Sume Format schemas use an allowlist: unknown keywords fail with unsupported_keyword. Number bounds are allowed; oneOf and allOf are not. Table inside.
A Sume Format output_schema is checked against an allowlist, not a blacklist. A keyword that is not on the list is a violation and returns unsupported_keyword. Number bounds minimum, maximum, exclusiveMinimum, exclusiveMaximum and multipleOf are on it. oneOf and allOf are not, so use anyOf. The root must be an object, every node needs a type, and $ref: "#" root recursion is refused even though OpenAI strict mode permits it. Source: Formats structured output, read 2026-10-06.
What passes and what fails?
A short map of the cases the docs call out.
| Keyword or shape | Status | Do this instead |
|---|---|---|
minimum, maximum, multipleOf | Allowed on numbers | Keep them |
exclusiveMinimum, exclusiveMaximum | Allowed on numbers | Keep them |
oneOf, allOf | Rejected | anyOf |
Node with no type | Rejected | Add a type |
| Non-object root | Rejected | Wrap in an object |
$ref: "#" at the root | Rejected | Inline the shape |
Where do I see the exact list?
The structured-output page lists every allowed keyword per type. Copy from it, and run your schema in a test Format run before you wire it into production code.
Sources
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