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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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TaglineRun any open-source AI model with an API call.Kuaishou's video model. The surprise standout.Autonomous AI agent that actually finishes tasks.VS Code fork that made AI coding actually work.
CategoryDev PlatformVideoAgentsCoding
PricingPay per second of computeCredit-based, free trialFree tier + $39-$199/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Anyone who wants top-tier video quality for less.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Developers. Non-developers who want to ship working code.
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
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • UX is rough for English speakers
  • Queue times
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Can feel overwhelming for non-coders
  • Expensive at scale
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 in the agent category. The first one I'd give to a non-technical friend.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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