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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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Groq
S
Sora
A
Lex
A
Perplexity
S
TaglineThe fastest AI inference in the world. Crazy low latency.OpenAI's video model. Long clips, cinematic quality.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.
CategoryDev PlatformVideoWritingResearch
PricingFree tier + pay-as-you-go APIIncluded with ChatGPT Plus/ProFree + $12/moFree + $20/mo Pro
Best forDevelopers who need sub-100ms LLM responses.ChatGPT subscribers experimenting with cinematic shots.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for speed. When latency is the product, start here.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.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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