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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GitHub Copilot B | Cartesia S | Luma Dream Machine A | Perplexity S | |
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| Tagline | Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration. | Ultra-low-latency voice. Built for realtime agents. | Smooth, cinematic motion. Image-to-video specialist. | AI search done right. Cited answers, not chat theater. |
| Category | Coding | Voice | Video | Research |
| Pricing | Free (limited) + $10/mo Pro + $19/mo Business | Free tier + usage-based API | Free + $10-$500/mo | Free + $20/mo Pro |
| Best for | Teams with GitHub already. Devs who don't want to change IDEs. | Developers building voice agents, phone bots, interactive apps. | Photographers animating stills, cinematic b-roll. | Replacing Google for any question where you want a cited answer in seconds. |
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| Kai's verdict | B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't. | S-tier for realtime. If latency matters more than voice catalog, start here. | A-tier. Best for cinematic image-to-video. Pair with Runway for coverage. | 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 → |