Compare AI tools
Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Kling A | NotebookLM S | Claude Agent SDK S | Perplexity S | |
|---|---|---|---|---|
| Tagline | Kuaishou's video model. The surprise standout. | Google's research notebook. Turns your docs into a podcast. | Anthropic's SDK for building your own agents on Claude. | AI search done right. Cited answers, not chat theater. |
| Category | Video | Research | Agents | Research |
| Pricing | Credit-based, free trial | Free | API usage + SDK is free | Free + $20/mo Pro |
| Best for | Anyone who wants top-tier video quality for less. | Students, researchers, anyone with a stack of PDFs or a topic to learn. | Developers building custom agents for their own company/product. | Replacing Google for any question where you want a cited answer in seconds. |
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| Kai's verdict | A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class. | S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs. | S-tier for builders. The right primitives. What Kai is built on under the hood. | S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week. |
| Link | Open → | Open → | Open → | Open → |