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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
A
Claude Code
S
GitHub Copilot
B
Claude
S
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Anthropic's flagship — best reasoning + longest useful context.
Categorycodingcodingcodingchat
PricingFree (open source) + whatever API you usePart of Claude Pro/Max/Team plansFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Pro + team/enterprise
Best forDevelopers who want open-source tooling with full control.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Teams with GitHub already. Devs who don't want to change IDEs.Long writing, code, careful thinking, documents over 50 pages.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Image generation is weak
  • No native web search on all tiers
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.
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