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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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Cartesia
S
Sora
A
Ideogram
S
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.OpenAI's video model. Long clips, cinematic quality.The one that actually gets text in images right.AI search done right. Cited answers, not chat theater.
CategoryVoiceVideoImageResearch
PricingFree tier + usage-based APIIncluded with ChatGPT Plus/ProFree + $8/mo + $20/mo + $60/moFree + $20/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.ChatGPT subscribers experimenting with cinematic shots.Anything with text — posters, ads, album covers, slide decks.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
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
  • 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
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Aesthetic ceiling below Midjourney
  • Less style variety
  • 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.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier for text-in-image. Use this for posters, Midjourney for art.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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