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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Replicate S | Cursor S | OpenAI Voice / Realtime S | Perplexity S | |
|---|---|---|---|---|
| Tagline | Run any open-source AI model with an API call. | VS Code fork that made AI coding actually work. | ChatGPT's voice + the Realtime API for developers. | AI search done right. Cited answers, not chat theater. |
| Category | Dev Platform | Coding | Voice | Research |
| Pricing | Pay per second of compute | Free + $20/mo Pro + $40/mo Business | Voice included with ChatGPT Plus; Realtime API by usage | Free + $20/mo Pro |
| Best for | Developers using open-source models (Flux, SDXL, Whisper, etc). | Developers. Non-developers who want to ship working code. | Voice chat users, developers building voice agents on OpenAI. | Replacing Google for any question where you want a cited answer in seconds. |
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| Kai's verdict | S-tier for open-source model APIs. The default in this space. | S-tier for coding. If you write code of any kind, this pays back the $20 in a day. | S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement. | 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 → |