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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
Hume AI
A
GitHub Copilot
B
Luma Dream Machine
A
TaglineChatGPT's voice + the Realtime API for developers.Voice AI that reads + expresses emotion.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Smooth, cinematic motion. Image-to-video specialist.
CategoryVoiceVoiceCodingVideo
PricingVoice included with ChatGPT Plus; Realtime API by usageFree tier + pay-as-you-goFree (limited) + $10/mo Pro + $19/mo BusinessFree + $10-$500/mo
Best forVoice chat users, developers building voice agents on OpenAI.Therapy apps, customer service, any voice agent where emotion matters.Teams with GitHub already. Devs who don't want to change IDEs.Photographers animating stills, cinematic b-roll.
Strengths
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Best image-to-video in the category
  • Great camera motion control
  • Ray 2 model produces striking shots
Weaknesses
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Niche use case
  • Pricing ramps fast
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Prompt fidelity below Runway
  • Queue times on free tier
Kai's verdictS-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.A-tier in its niche. The only one that actually gets emotion right.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. Best for cinematic image-to-video. Pair with Runway for coverage.
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