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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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Aider
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Claude Code
S
Perplexity
S
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.Open-source VS Code agent. Reads + writes + runs.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI search done right. Cited answers, not chat theater.
CategoryCodingCodingCodingResearch
PricingFree (open source) + whatever API you useFree (open source) + your API costsPart of Claude Pro/Max/Team plansFree + $20/mo Pro
Best forDevelopers who want open-source tooling with full control.VS Code users who want agentic coding without changing IDEs.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.A-tier. Best free agentic option in VS Code. Use with Claude for best results.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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