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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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GitHub Copilot
B
Grammarly
A
Groq
S
Windsurf
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Grammar check + tone + AI drafting, everywhere you type.The fastest AI inference in the world. Crazy low latency.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryCodingWritingDev PlatformCoding
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $12-$15/mo Premium + team plansFree tier + pay-as-you-go APIFree + $15/mo Pro
Best forTeams with GitHub already. Devs who don't want to change IDEs.Non-native English writers, business email, anyone who types a lot.Developers who need sub-100ms LLM responses.Developers who want Cursor-like power for less money.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Smaller community
  • Model selection more limited
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier for speed. When latency is the product, start here.A-tier. Close second to Cursor. If $5/mo matters, start here.
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