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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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GitHub Copilot
B
DALL-E 3
B
Cartesia
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.OpenAI's image model. Built into ChatGPT Plus.Ultra-low-latency voice. Built for realtime agents.
Categorycodingimagevoice
PricingFree (limited) + $10/mo Pro + $19/mo BusinessIncluded with ChatGPT Plus $20/moFree tier + usage-based API
Best forTeams with GitHub already. Devs who don't want to change IDEs.ChatGPT Plus users who want images without paying extra.Developers building voice agents, phone bots, interactive apps.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.S-tier for realtime. If latency matters more than voice catalog, start here.
LinkOpen →Open →Open →