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