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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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OpenRouter
S
Perplexity
S
Cline
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.AI search done right. Cited answers, not chat theater.Open-source VS Code agent. Reads + writes + runs.
CategoryDev PlatformResearchCoding
PricingPay per token — model-dependentFree + $20/mo ProFree (open source) + your API costs
Best forDevelopers experimenting across models. Apps that want fallback logic.Replacing Google for any question where you want a cited answer in seconds.VS Code users who want agentic coding without changing IDEs.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can burn tokens fast if not watched
  • Less polished than Cursor
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Best free agentic option in VS Code. Use with Claude for best results.
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