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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
Claude Code
S
Manus
S
Gemini
A
TaglineChatGPT's voice + the Realtime API for developers.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Autonomous AI agent that actually finishes tasks.Google's answer. Best integrated with Workspace + free for a lot.
CategoryVoiceCodingAgentsChatbots
PricingVoice included with ChatGPT Plus; Realtime API by usagePart of Claude Pro/Max/Team plansFree tier + $39-$199/moFree + $20/mo Advanced (bundled with 2TB Drive)
Best forVoice chat users, developers building voice agents on OpenAI.Developers who want an agent, not autocomplete. Large refactors, tests, docs.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.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
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • 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
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • 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.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier in the agent category. The first one I'd give to a non-technical friend.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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