Form blocks by engine: what Mistral, Landing AI and Reducto mark on a form

Every OCR engine sorts a page into blocks of fixed types. Which types Mistral, Landing AI and Reducto each have for the parts of a form (fields, checkboxes, key-value pairs, signatures), and what came back on our form pages.

Key takeaways

• Mistral OCR 4.1 has no form block: of its 13 types only signature helps, and checkboxes appear inside list items.
• Landing AI's field type (checkbox, radio, write-in, each blank or filled) is only on its DPT-3 Verity preview, and none came back on our 8 form pages.
• Reducto returns Key Value blocks: the most common type on our 8 form pages, 27 of them.

The scoreboard

How it was measured

Block types and settings come from each vendor's API spec, the definitive list, and its docs pages, read on Oct 3 2026. What came back comes from the raw responses of our runs on the 8 form pages of the Forms · Level 1 board, and for Mistral from the 1,487 pages stored in our app. This board ranks nothing: it records what each engine can tell you about a form before any second pass.

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