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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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OpenAI Voice / Realtime
S
Fireflies
A
GitHub Copilot
B
Aider
A
TaglineChatGPT's voice + the Realtime API for developers.Sales-focused meeting AI with CRM integration.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Terminal-based AI pair programmer. Git-aware, model-flexible.
CategoryVoiceMeetingsCodingCoding
PricingVoice included with ChatGPT Plus; Realtime API by usageFree + $10-$19/user/moFree (limited) + $10/mo Pro + $19/mo BusinessFree (open source) + whatever API you use
Best forVoice chat users, developers building voice agents on OpenAI.Sales teams, customer success, anyone running many discovery calls.Teams with GitHub already. Devs who don't want to change IDEs.Developers who want open-source tooling with full control.
Strengths
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Good CRM integrations (Salesforce, HubSpot)
  • Talk-time + sentiment analytics
  • Call scoring
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictS-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.A-tier for sales teams. B-tier for solo users.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
LinkOpen →Open →Open →Open →