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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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DeepSeek
S
Runway
S
GitHub Copilot
B
OpenRouter
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.The pro's AI video tool. Gen-4 is the current bar.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.One API, every model. Pay-as-you-go, no subscriptions.
Categorychatvideocodingdev platform
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $15-$95/moFree (limited) + $10/mo Pro + $19/mo BusinessPay per token — model-dependent
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Marketing video, pitch decks, b-roll, creative shorts.Teams with GitHub already. Devs who don't want to change IDEs.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Expensive at scale
  • Still needs post-editing
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier. Market leader with reason. Start here for serious video.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →Open →