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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
Stable Audio
A
GitHub Copilot
B
Gemini
A
TaglineChatGPT's voice + the Realtime API for developers.Stability AI's open audio model. Loops + SFX + background.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Google's answer. Best integrated with Workspace + free for a lot.
CategoryVoiceAudioCodingChatbots
PricingVoice included with ChatGPT Plus; Realtime API by usageFree + $12/mo Pro + enterpriseFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Advanced (bundled with 2TB Drive)
Best forVoice chat users, developers building voice agents on OpenAI.Game developers, podcasters needing SFX, video creators needing background music.Teams with GitHub already. Devs who don't want to change IDEs.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • 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
Weaknesses
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Not for full songs with vocals
  • Shorter generation limits
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.B-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.
LinkOpen →Open →Open →Open →