Google Deep Review

Opened to the public worldwide on October 14, 2026 by Google Research (with Google DeepMind and Google Cloud), Deep Review is an agentic AI system that gives rigorous feedback and technical verification on complex documents. It checks logical consistency and mathematical statements, suggests improvements, grounds facts, and compares work against existing research — leaving higher-level judgment to humans. It works through a four-stage pipeline: document segmentation, adaptive budgeting for information-dense sections, deep parallel verification by specialized reasoning agents with full-document context, and global synthesis with external grounding checks.

Key facts: Deep Review evolved from the experimental "Paper Assistant Tool," piloted over the past year with four flagship CS conferences (STOC 2026, ICML 2026, NeurIPS 2026, ICLR 2027), which gave private pre-submission feedback to the authors of 16,000+ manuscripts who opted in. Beyond papers it handles design documents, presentations (checking slide takeaways match the charts) and legal/financial documents (clause consistency, ambiguous terms). Gemini 4 Argon support is rolling out.

Plans: genuinely free — every user gets two complimentary document reviews per week, worldwide, with no payment required (Google account sign-in). High-volume users can connect their own Gemini API key for higher limits and programmatic access via the Deep Review API, paying standard Gemini API charges with no additional Deep Review fee (independent estimate: ~$3 for a 40-page document at Low effort with Gemini 3.8 Flash, ~$20 at Extra High with Gemini 4 Argon). Privacy: Google says uploaded documents are never used to train, fine-tune or improve its models, and are stored for one year solely for display in the Deep Review UI — teams should weigh a year of retention before uploading client material.

Best for: researchers stress-testing manuscripts, engineers reviewing design docs, founders and lawyers sanity-checking contracts, analysts checking financial documents. Launch inputs: PDFs and plain text (Google Docs and Slides also listed); one document per review for now, multi-file input coming soon.

YouTube walkthrough: KiwisExplains short: what Deep Review checks, and what to know

Related: ChatGPT · Perplexity

Pros

• Gives rigorous feedback and technical verification on complex documents, checking logical consistency and mathematical statements.
• Grounds facts and compares work against existing research, while leaving higher-level judgment to humans.
• Handles papers, design documents, presentations and legal or financial documents, not just one format.
• Google states uploaded documents are never used to train, fine-tune or improve its models.

Watch out for

• It is a reviewer, not a judge. Higher-level judgment still belongs to humans.
• One document per review for now, with multi-file input coming soon, so large sets need separate reviews.
• Documents are stored for one year solely for display in the Deep Review UI, so weigh retention before uploading client material.
• API-based reviews carry standard Gemini API charges, so high-volume use needs a cost check.

Best for

Best for: researchers stress-testing manuscripts, engineers reviewing design docs, and founders, lawyers and analysts sanity-checking contracts and financial documents. Who should skip it: anyone who needs a final accept or reject decision, or who cannot accept a year of document retention.

Pricing

Deep Review is genuinely free for every user, with two complimentary document reviews per week worldwide and no payment required beyond a Google account sign-in. High-volume users can connect their own Gemini API key for higher limits and programmatic access, paying standard Gemini API charges with no additional Deep Review fee. Check the official page for current limits.

FAQs

What does Deep Review check? Logical consistency, mathematical statements, suggested improvements, grounded facts and comparison against existing research.

Is it free? Yes. Every user gets two complimentary document reviews per week, with no payment required.

What can I upload? PDFs and plain text, with Google Docs and Slides also listed. One document per review for now.

Are my documents used for training? Google states uploaded documents are never used to train, fine-tune or improve its models.