Your guess is correct
. We plan to publish a more detailed blog post on LLM OCR hallucinations soon, but to summarize:
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OCR Engine 1 and OCR Engine 2 are classic OCR engines, they do not have any hallucinations.
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OCR Engine 3 is LLM-based. This brings superior OCR quality for tricky documents but also the side effect of hallucinations in some situations.