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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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Dev Platform
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OpenRouter
S
Claude
S
Rows
A
Writesonic
B
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Anthropic's flagship — best reasoning + longest useful context.Spreadsheets with AI + live integrations baked in.SEO-first AI writer. Optimized for ranking content.
CategoryDev PlatformChatbotsDataMarketing
PricingPay per token — model-dependentFree + $20/mo Pro + team/enterpriseFree + $19-$89/user/moFree + $15-$99/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Long writing, code, careful thinking, documents over 50 pages.Ops teams, marketers, anyone building dashboards from multiple sources.Content marketers churning out SEO articles.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Image generation is weak
  • No native web search on all tiers
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
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