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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
Windsurf
A
OpenAI Voice / Realtime
S
Grammarly
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Codeium's agentic IDE. Cascade agent + strong free tier.ChatGPT's voice + the Realtime API for developers.Grammar check + tone + AI drafting, everywhere you type.
Categorycodingcodingvoicewriting
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $15/mo ProVoice included with ChatGPT Plus; Realtime API by usageFree + $12-$15/mo Premium + team plans
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers who want Cursor-like power for less money.Voice chat users, developers building voice agents on OpenAI.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Smaller community
  • Model selection more limited
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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