Cheapest deep research AI
The cheapest deep research AI is not a single answer, because the two things people mean by "deep research" are priced completely differently. If you want a chat assistant that can go away and research for you, the going rate is $20/mo. If you want a finished, sourced report as the deliverable, the price range is wider and starts lower. Everything below was read from the vendors' own pages on 2026-07-29.
What deep research costs, by vendor
| Tool | Free tier | Entry paid | Top individual tier |
|---|---|---|---|
| uooki | $0 — 100 credits (one-time) | $9.9/mo billed yearly ($12.9 monthly) | Studio $47.9/mo yearly — 24,000 credits/mo |
| ChatGPT | Free plan available | Plus $20/mo | Pro (higher tier; OpenAI does not publish per-plan research quotas) |
| Perplexity | $0 — search with citations, basic models, limited use | Pro $20/mo — 4,000 bonus credits | Max $200/mo — 10,000 credits/mo + 35,000 extra |
| Elicit | Basic free — limited Research Agent and Reports | Pro $49/mo ($588/yr) | Scale $169/mo ($2,028/yr) |
Prices read from the vendors' own pricing pages on 2026-07-29 (uooki, OpenAI Help Center — What is ChatGPT Plus?, Perplexity, Elicit). Vendors change pricing without notice — check the linked pages before you buy.
Why per-query limits are hard to compare now
Until recently you could rank these tools by deep-research runs per month. That has stopped being possible for the largest one: OpenAI's deep research help page now states only that "deep research usage varies by plan" and points you at an in-product counter, with allowances resetting every 30 days from first use. The specific per-tier numbers that circulate widely in comparison posts have been removed from the official documentation, so we are not repeating them here — a number you cannot check is worse than no number.
Perplexity publishes credits rather than runs: 4,000 bonus credits on Pro, 10,000 a month plus 35,000 extra on Max, with Max described as raising the quotas for deep research, asset generation and file uploads. Elicit publishes capability limits instead — Pro screens 5,000 papers, Enterprise 40,000.
The practical consequence: compare these on output, not on allowance. Run the same question through two of them on their free tiers and look at what comes back. That takes twenty minutes and tells you more than any quota table, including this one.
Deep research vs an AI agent — they are not the same product
"Deep research vs AI agent" is a common search, and the distinction is real:
Deep research reads
It plans a line of enquiry, searches, reads across many sources, and synthesises a documented answer with citations. The output is knowledge. ChatGPT deep research, Perplexity and Elicit all sit here.
An agent does
It takes actions — writes files, runs code, builds things, calls tools — and the output is an artifact. The research is a step, not the deliverable.
uooki runs both loops
LiveResearch produces the sourced report; LivePage turns findings into a working dashboard or site. "Research the market, then build me a dashboard of it" is one conversation rather than two subscriptions.
Why it matters for price
If you only ever need the reading, a $20 research assistant is the right purchase and a builder is waste. If your research routinely ends in a document, deck or dashboard someone else has to read, paying twice is the more common mistake.
Is deep research AI legitimate?
The technology is real and the failure mode is specific. These tools genuinely read across many sources and synthesise them, and the good ones cite every claim so you can check it. What they cannot do is know when a source is wrong, and a confident synthesis of three bad sources reads exactly like a confident synthesis of three good ones.
That is why citations are the feature that matters most, and why any tool that gives you conclusions without links is unusable for anything that carries consequences. ChatGPT's deep research attaches citations and lets you restrict research to specific sites you nominate. Perplexity puts inline citations on every answer. uooki's reports carry their sources. Use that: spot-check two or three of the load-bearing claims before you rely on a report, every time, regardless of vendor.
The other honest caveat is time. A real deep research run takes minutes, not seconds, across all of these tools. Anything that returns a "researched report" instantly did a normal search.
Frequently asked
- What is the cheapest deep research AI?
- Among the tools priced here on 2026-07-29, uooki has the lowest paid entry at $9.9/mo billed yearly, plus a $0 tier with 100 one-time credits. ChatGPT Plus and Perplexity Pro are both $20/mo. Elicit Pro is $49/mo but is specialised for academic literature, which is a different job.
- What does OpenAI deep research cost?
- It is included with paid ChatGPT plans rather than sold separately; ChatGPT Plus is $20/month. OpenAI no longer publishes per-plan deep research quotas — its help page states usage varies by plan and directs you to an in-product usage counter that resets every 30 days from your first use.
- What does Perplexity deep research cost?
- Perplexity Pro is $20/mo and includes 4,000 bonus credits plus access to Perplexity Computer and advanced data sources. Max is $200/mo with 10,000 credits a month and 35,000 extra credits, and raises the deep research, asset generation and file upload quotas. The free tier is search-only with citations.
- Which deep research AI is best?
- For academic literature specifically, Elicit — it screens papers at scale and is built for systematic review. For fast, well-cited answers inside a search workflow, Perplexity. For a finished report you can hand to someone, or research that has to end in a dashboard or deck, uooki. For general-purpose depth inside an assistant you already pay for, ChatGPT.
- Is deep research AI worth it?
- It is worth it when the alternative is two hours of tab-opening, and not worth it when you need one fact — a normal search is faster. The break-even is roughly the point where you would otherwise have to read five or more sources and reconcile them yourself.
[ sources ]
- uooki pricing — checked 2026-07-29
- OpenAI Help Center — What is ChatGPT Plus? — checked 2026-07-29
- OpenAI Help Center — Deep research in ChatGPT — checked 2026-07-29
- Perplexity pricing — checked 2026-07-29
- Elicit pricing — checked 2026-07-29
Try it on your own brief.
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