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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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Claude Code
S
GitHub Copilot
B
Claude Agent SDK
S
Grammarly
A
TaglineAnthropic's CLI agent. Opus-powered, operates on your repo directly.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Anthropic's SDK for building your own agents on Claude.Grammar check + tone + AI drafting, everywhere you type.
Categorycodingcodingagentswriting
PricingPart of Claude Pro/Max/Team plansFree (limited) + $10/mo Pro + $19/mo BusinessAPI usage + SDK is freeFree + $12-$15/mo Premium + team plans
Best forDevelopers who want an agent, not autocomplete. Large refactors, tests, docs.Teams with GitHub already. Devs who don't want to change IDEs.Developers building custom agents for their own company/product.Non-native English writers, business email, anyone who types a lot.
Strengths
  • 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
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Developer-only
  • You build the UI
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictS-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 builders. The right primitives. What Kai is built on under the hood.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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