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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
OpenRouter
S
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.One API, every model. Pay-as-you-go, no subscriptions.
Categorycodingcodingvoicedev platform
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $15/mo ProVoice included with ChatGPT Plus; Realtime API by usagePay per token — model-dependent
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.Developers experimenting across models. Apps that want fallback logic.
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
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
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
  • Slight markup over direct API
  • Some provider features not exposed
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.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →Open →