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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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Coding
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Chatbots
Image
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Voice
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Audio
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Dev Platform
Data
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Cartesia
S
DALL-E 3
B
Cursor
S
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.OpenAI's image model. Built into ChatGPT Plus.VS Code fork that made AI coding actually work.AI search done right. Cited answers, not chat theater.
CategoryVoiceImageCodingResearch
PricingFree tier + usage-based APIIncluded with ChatGPT Plus $20/moFree + $20/mo Pro + $40/mo BusinessFree + $20/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.ChatGPT Plus users who want images without paying extra.Developers. Non-developers who want to ship working code.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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