Structured Outputs limits are raised to support larger schemas:
Object properties: from 100 → 5,000
Characters in string: 15,000 → 120,000
Enum values: 500 → 1,000
Total characters across string members in enums with >250 values: 7,500 → 15,000
https://platform.openai.com/docs/guides/structured-outputs?api-mode=responses#supported-schemas
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