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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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S
Pika
A
Hume AI
A
Gemini
A
TaglineRun any open-source AI model with an API call.The playful, accessible AI video tool.Voice AI that reads + expresses emotion.Google's answer. Best integrated with Workspace + free for a lot.
CategoryDev PlatformVideoVoiceChatbots
PricingPay per second of computeFree + $8-$58/moFree tier + pay-as-you-goFree + $20/mo Advanced (bundled with 2TB Drive)
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Social media creators, beginners, anyone wanting quick fun clips.Therapy apps, customer service, any voice agent where emotion matters.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
  • Detects + mirrors emotional tone
  • EVI (Empathic Voice Interface) feels different
  • Expressive voice output
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
  • Niche use case
  • Pricing ramps fast
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for social/casual. B-tier for serious work. Good entry point.A-tier in its niche. The only one that actually gets emotion right.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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