In short
How they differ.
Worked out from the makers' own pages, read Oct 20, 2026. Prices change; check before you pay.
- Only ChatGPT deep research has a free plan.
- Kagi Assistant's cheapest paid plan is cheaper: $5 a month against $8.
- ChatGPT deep research also has a computer app.
Side by side
The details.
| ChatGPT deep research | Kagi Assistant | |
|---|---|---|
| Made by | OpenAI · United States | Kagi · United States |
| What it says it is | “Deep research helps you accomplish complex online tasks by reasoning, researching, and synthesizing information” | “Kagi Assistant combines the top large language models (LLMs) with optional results from Kagi Search” |
| Free plan | YesPricing page lists "Limited deep research" on Free and Go; Plus "Expanded deep research"; Pro "Maximum deep research". Help center: "Deep research usage varies by plan." Exact task counts not published on the pages read. | NoNo free plan; a free Trial is capped at 100 searches and 100 Assistant interactions. "Assistant is available to all members." |
| Plans | Free: freeGo: $8 a monthPlus: $20 a monthPro: $100 a monthBusiness: $25 a month | Trial: freeStarter: $5 a monthProfessional: $10 a monthUltimate: $25 a month |
| Runs on | web, desktop, mobile | web, mobile apps |
| Latest update | — | Smarter search widgets, Privacy Pass upgrades, and a calmer Assistant, Oct 16, 2026 |
| Its terms | “When you use our services for individuals (Free, Plus, Pro), we may use your content to train our models.”What it does with your data · OpenAI Help Center: How your data is used to improve model performance | “By default and unless otherwise stated, Kagi Assistant automatically deletes conversation threads after one day.”What it does with your data · Kagi Privacy Policy |
| Disputes | None on file | None on file |
| Sources | Prices, Oct 20, 2026 · Description · company-reported | Prices, Oct 20, 2026 · Description · company-reported |
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