[DigitalToday reporter Jae-won Choi (최재원)] Google has unveiled Deep Review, an AI tool that finds hidden logical contradictions and mathematical errors in research papers and technical documents. It verifies complex documents through collaboration among multiple AI agents and can be used not only for academic papers but also in legal and finance fields.

On Oct. 15 (local time), Japan's GigaZine reported that Google made Deep Review available to general users worldwide the previous day. It aims to address the problem that generative AI has sped up document writing, but checking accuracy is still handled by humans.

Deep Review reviews long documents by splitting them into sections such as the introduction, research methods, experimental results and mathematical proofs rather than analyzing them all at once. It allocates more computing resources to complex proofs, and AI agents responsible for each area search for errors in parallel. A separate agent then consolidates the results and cross-checks them against external materials to reduce duplicate or incorrect findings.

Its performance has also drawn attention. Google tested 26 math and computer science papers with its existing Paper Assistant Tool (PAT) and found it detected 89.7 percent of 29 confirmed errors. That was about 34.5 percentage points higher than the 55.2 percent detection rate when Gemini 3.1 Pro was used alone.

Google also ran pilot tests on more than 16,000 research papers in cooperation with major conferences including STOC 2026, ICML 2026, NeurIPS 2026 and ICLR 2027. In an ICML 2026 pilot survey, 35.4 percent of respondents said they were flagged for significant theoretical issues, and 31 percent said they ran new experiments reflecting the AI's feedback.

The public version adds support for the latest AI model, Gemini 4 Argon. Beyond papers, it can also check inconsistencies in software design documents, legal contracts, financial statements and presentations.

The free usage limit is twice a week, and usage can be increased by connecting a Gemini API key. For now, it supports PDF and plain text as input formats.

Still, there are cases where the AI judges a valid proof as an error, so expert judgment is needed for final verification. Google has a policy of using Deep Review as a technology that supports document verification, not as a tool to replace human reviewers.