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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
Gemini
A
Manus
S
OpenAI Voice / Realtime
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Google's answer. Best integrated with Workspace + free for a lot.Autonomous AI agent that actually finishes tasks.ChatGPT's voice + the Realtime API for developers.
CategoryCodingChatbotsAgentsVoice
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Advanced (bundled with 2TB Drive)Free tier + $39-$199/moVoice included with ChatGPT Plus; Realtime API by usage
Best forTeams with GitHub already. Devs who don't want to change IDEs.Anyone already on Google, research tasks, summarizing long documents.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Voice chat users, developers building voice agents on OpenAI.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.
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