JSON mode explained: when schema enforcement beats prompting
JSON mode vs structured output: how constrained decoding works, when 3% failure rates become a real cost, and which enforcement approach your pipeline needs.
Tag · json
JSON mode vs structured output: how constrained decoding works, when 3% failure rates become a real cost, and which enforcement approach your pipeline needs.
Three tiers of LLM JSON output validation in 2026: schema (Zod), semantic checks, and retry with reprompt. Includes cost math at 1,000 requests per day.
Which LLMs hit 99%+ JSON schema compliance natively in 2026, which need format enforcement middleware, and the real cost of retries at scale.