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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
Gemini
A
Claude Code
S
Fathom
S
TaglineChatGPT's voice + the Realtime API for developers.Google's answer. Best integrated with Workspace + free for a lot.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Meeting notes, free forever for individuals.
CategoryVoiceChatbotsCodingMeetings
PricingVoice included with ChatGPT Plus; Realtime API by usageFree + $20/mo Advanced (bundled with 2TB Drive)Part of Claude Pro/Max/Team plansFree for individuals + $15-$29/user/mo teams
Best forVoice chat users, developers building voice agents on OpenAI.Anyone already on Google, research tasks, summarizing long documents.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Solo operators, freelancers, small teams on a budget.
Strengths
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
Weaknesses
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Bot-joining model
  • Team features gated
Kai's verdictS-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for solo + free. The best free option, hands down.
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