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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
Gemini
A
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v0
S
TaglineRun any open-source AI model with an API call.Google's answer. Best integrated with Workspace + free for a lot.Open-source VS Code agent. Reads + writes + runs.Vercel's AI-powered UI generator. Prompt to shadcn component.
CategoryDev PlatformChatbotsCodingDesign
PricingPay per second of computeFree + $20/mo Advanced (bundled with 2TB Drive)Free (open source) + your API costsFree + $20/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Anyone already on Google, research tasks, summarizing long documents.VS Code users who want agentic coding without changing IDEs.Frontend devs, PMs prototyping UIs, anyone on Next.js.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Best for shadcn stack
  • Iterating can be fiddly
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier. Best free agentic option in VS Code. Use with Claude for best results.S-tier. If you're on Vercel/shadcn, this is cheating.
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