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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
Cline
A
Rows
A
NotebookLM
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Open-source VS Code agent. Reads + writes + runs.Spreadsheets with AI + live integrations baked in.Google's research notebook. Turns your docs into a podcast.
CategoryDev PlatformCodingDataResearch
PricingPay per token — model-dependentFree (open source) + your API costsFree + $19-$89/user/moFree
Best forDevelopers experimenting across models. Apps that want fallback logic.VS Code users who want agentic coding without changing IDEs.Ops teams, marketers, anyone building dashboards from multiple sources.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Google-only
  • Can be slow on large corpora
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. Best free agentic option in VS Code. Use with Claude for best results.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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