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Undocumented and unclear constraint limits for structured outputs

5/10 Medium

Developers encounter mysterious failures when working with structured outputs (schemas/grammars) but cannot determine the actual limits causing the failures. The documentation does not clearly explain constraints, making it impossible to debug or optimize queries effectively.

Gemini API
Category
docs
Workaround
none
Stage
debug
Freshness
persistent
Scope
single_lib
Upstream
open
Recurring
Yes
Buyer Type
team
Maintainer
slow

Sources

Collection History

Query: “What are the most common pain points with Gemini API for developers in 2025?”3/30/2026

But as end users we have no way of figuring out what the actual limits are. OpenAI has more generous limits on the schemas and clearer docs.

Created: 3/30/2026Updated: 3/30/2026