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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Claude Agent SDK S | Perplexity S | Kling A | Hugging Face S | |
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| Tagline | Anthropic's SDK for building your own agents on Claude. | AI search done right. Cited answers, not chat theater. | Kuaishou's video model. The surprise standout. | The GitHub of AI. Models, datasets, spaces — all in one. |
| Category | Agents | Research | Video | Dev Platform |
| Pricing | API usage + SDK is free | Free + $20/mo Pro | Credit-based, free trial | Free + $9-$20/mo + enterprise |
| Best for | Developers building custom agents for their own company/product. | Replacing Google for any question where you want a cited answer in seconds. | Anyone who wants top-tier video quality for less. | Any ML/AI developer. Hobbyists exploring open models. |
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| Kai's verdict | 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. | A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class. | S-tier infrastructure. The one platform every AI dev eventually uses. |
| Link | Open → | Open → | Open → | Open → |