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Streaming structured output: client gets tokens as they arrive and tries to parse partial JSON progressively for UI updates (showing fields as they complete). 15-20% of streams produce unparseable intermediate states even though the final stream is valid. Current approach (trying JSON.parse on every token) fails on every partial stream.
OpenAI's structured outputs mode returns valid JSON that matches the schema syntactically but picks the first enum value regardless of input when the enum has >20 values and is nullable. Reducing the enum or making it non-nullable fixes it. Reproduced on gpt-4o and gpt-4o-mini.