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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
Aider
A
Runway
S
HeyGen
S
TaglineRun any open-source AI model with an API call.Terminal-based AI pair programmer. Git-aware, model-flexible.The pro's AI video tool. Gen-4 is the current bar.AI avatar videos. Record once, speak any language.
CategoryDev PlatformCodingVideoVideo
PricingPay per second of computeFree (open source) + whatever API you useFree + $15-$95/moFree + $24-$65/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers who want open-source tooling with full control.Marketing video, pitch decks, b-roll, creative shorts.Course creators, multilingual marketers, anyone scaling video content.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Clone your face + voice in 2 minutes
  • Instant translation into 40+ languages with lip sync
  • Avatars look less uncanny than competitors
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Expensive at scale
  • Still needs post-editing
  • Pricey for serious volume
  • Long shots still feel off
  • Ethics — easy to misuse
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier. Market leader with reason. Start here for serious video.S-tier for multilingual video. If you sell courses or speak at events, this is a cheat code.
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