Last updated: · Methodology
Comparison
| Tool | Rank | Tier · score | Free tier | Paid | Best for |
|---|---|---|---|---|---|
| Gemini Deep Research + Notebook | #1 | A 8.4 | Free: Deep Research, Notebook | Google AI Plus/Pro/Ultra ($99.99+) for more | Researching libraries and long docs |
| ChatGPT deep research ⚠ Dollar prices unverified | #2 | A 8.4 | Limited in Free | Expanded in Plus, maximum in Pro (prices unverified) | General technical research |
| Claude Research | #3 | A 8.4 | Web search in Free | Research on Pro $20/mo | Long technical write-ups |
⚠ marks a price or plan detail we couldn't fully confirm on the official page. Scores: 0.4×Quality + 0.2×Ease + 0.2×Value + 0.2×Momentum, editorial judgments, not lab tests.
Who should pick which
- Pick Gemini Deep Research + Notebook for: Researching libraries and long docs.
- Pick ChatGPT deep research for: General technical research.
- Pick Claude Research for: Long technical write-ups.
FAQ
Which one is free?
Free-tier notes from our board: Gemini Deep Research + Notebook: Free: Deep Research, Notebook; ChatGPT deep research: Limited in Free; Claude Research: Web search in Free.
How do they differ?
What our rankings note on each: Gemini Deep Research + Notebook: Free deep research; up to 1,500-page uploads on Pro; ChatGPT deep research: Widely rated best all-round assistant (Efficient App); Claude Research: Strong reasoning and 1M-token context. We haven't run our own long-document tests yet.
Should I pay for more than one?
Usually not. Skip the extra subscription if you already pay for ChatGPT Plus or Claude Pro: use the research mode you already have instead of adding another subscription. Overlapping assistants are a common find in the AI Stack Audit.
How does ToolTier rank these tools?
Each tool is scored 1–10 on quality (40%), ease (20%), price/value (20%), and momentum (20%). Scores are editorial judgments built from public benchmarks, published reviews, and official pricing pages, not hands-on lab tests yet. We re-check the rankings every Monday and log every change. How we rank.
Does ToolTier get paid by these tools?
Of the tools on this page: we found no affiliate program for Gemini Deep Research + Notebook, ChatGPT deep research, Claude Research. Some links on ToolTier are or may become affiliate links, which can pay us if you buy. Rankings are never for sale, and payment never changes a ranking. How we make money.
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