Best LLM for OCR and document parsing in 2026: GPT-5.5 wins 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. Jun 8, 2026 · 7 min read use-casebenchmarksdocument-parsing