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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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Cartesia
S
Replicate
S
Cursor
S
Sora
A
TaglineUltra-low-latency voice. Built for realtime agents.Run any open-source AI model with an API call.VS Code fork that made AI coding actually work.OpenAI's video model. Long clips, cinematic quality.
CategoryVoiceDev PlatformCodingVideo
PricingFree tier + usage-based APIPay per second of computeFree + $20/mo Pro + $40/mo BusinessIncluded with ChatGPT Plus/Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Developers using open-source models (Flux, SDXL, Whisper, etc).Developers. Non-developers who want to ship working code.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.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.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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