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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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S
Cartesia
S
Ollama
S
Sora
A
TaglineRun any open-source AI model with an API call.Ultra-low-latency voice. Built for realtime agents.Run LLMs locally. One-line install, GUI optional.OpenAI's video model. Long clips, cinematic quality.
CategoryDev PlatformVoiceDev PlatformVideo
PricingPay per second of computeFree tier + usage-based APIFree + open sourceIncluded with ChatGPT Plus/Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers building voice agents, phone bots, interactive apps.Devs wanting offline/local LLMs for privacy or experimentation.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for realtime. If latency matters more than voice catalog, start here.S-tier for local inference. If you care about privacy or want to tinker, install this today.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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