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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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Elicit
S
OpenRouter
S
Perplexity
S
Luma Dream Machine
A
TaglineAI research assistant for academic literature.One API, every model. Pay-as-you-go, no subscriptions.AI search done right. Cited answers, not chat theater.Smooth, cinematic motion. Image-to-video specialist.
CategoryResearchDev PlatformResearchVideo
PricingFree + $12-$42/moPay per token — model-dependentFree + $20/mo ProFree + $10-$500/mo
Best forGrad students, researchers, anyone doing literature reviews.Developers experimenting across models. Apps that want fallback logic.Replacing Google for any question where you want a cited answer in seconds.Photographers animating stills, cinematic b-roll.
Strengths
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Best image-to-video in the category
  • Great camera motion control
  • Ray 2 model produces striking shots
Weaknesses
  • Academic-only
  • Can hallucinate citations — verify everything
  • Slight markup over direct API
  • Some provider features not exposed
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Prompt fidelity below Runway
  • Queue times on free tier
Kai's verdictS-tier for academic research. Nothing else comes close for systematic reviews.S-tier for model-shopping. I use this for every prototype before committing.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Best for cinematic image-to-video. Pair with Runway for coverage.
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