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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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GitHub Copilot
B
OpenRouter
S
Perplexity
S
Writesonic
B
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.One API, every model. Pay-as-you-go, no subscriptions.AI search done right. Cited answers, not chat theater.SEO-first AI writer. Optimized for ranking content.
Categorycodingdev platformresearchmarketing
PricingFree (limited) + $10/mo Pro + $19/mo BusinessPay per token — model-dependentFree + $20/mo ProFree + $15-$99/mo
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers experimenting across models. Apps that want fallback logic.Replacing Google for any question where you want a cited answer in seconds.Content marketers churning out SEO articles.
Strengths
  • 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
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
Kai's verdictB-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.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
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