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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
Kling
A
Groq
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Manus
S
TaglineRun any open-source AI model with an API call.Kuaishou's video model. The surprise standout.The fastest AI inference in the world. Crazy low latency.Autonomous AI agent that actually finishes tasks.
CategoryDev PlatformVideoDev PlatformAgents
PricingPay per second of computeCredit-based, free trialFree tier + pay-as-you-go APIFree tier + $39-$199/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Anyone who wants top-tier video quality for less.Developers who need sub-100ms LLM responses.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • UX is rough for English speakers
  • Queue times
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for speed. When latency is the product, start here.S-tier in the agent category. The first one I'd give to a non-technical friend.
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