Best LLMs for structured output in 2026: hit rates and retry costs
Which LLMs hit 99%+ JSON schema compliance natively in 2026, which need format enforcement middleware, and the real cost of retries at scale.
Tag · structured-output
Which LLMs hit 99%+ JSON schema compliance natively in 2026, which need format enforcement middleware, and the real cost of retries at scale.
We benchmarked 4 LLMs on 6 real OCR tasks: receipts, invoices, prescriptions. GPT-5.5 wins 10/18 matchups; Haiku 4.5 crumbles on JSON formatting.