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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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Replit Agent A | Hex A | Kling A | Perplexity S | |
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| Tagline | Replit's AI that builds + deploys full apps on their platform. | Modern data notebook with Magic AI assistant. | Kuaishou's video model. The surprise standout. | AI search done right. Cited answers, not chat theater. |
| Category | Coding | Data | Video | Research |
| Pricing | $10-$25/mo Core/Teams | Free + $28+/user/mo | Credit-based, free trial | Free + $20/mo Pro |
| Best for | Teachers, students, prototypers, hackathon builders. | Data teams at startups + enterprises. | Anyone who wants top-tier video quality for less. | Replacing Google for any question where you want a cited answer in seconds. |
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| Kai's verdict | A-tier. Best for teaching a kid to code in 2026. | A-tier for data teams. S-tier if you already live in SQL + Python. | A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class. | 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 → |