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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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Replicate
S
Fathom
S
Sora
A
Manus
S
TaglineRun any open-source AI model with an API call.Meeting notes, free forever for individuals.OpenAI's video model. Long clips, cinematic quality.Autonomous AI agent that actually finishes tasks.
CategoryDev PlatformMeetingsVideoAgents
PricingPay per second of computeFree for individuals + $15-$29/user/mo teamsIncluded with ChatGPT Plus/ProFree tier + $39-$199/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Solo operators, freelancers, small teams on a budget.ChatGPT subscribers experimenting with cinematic shots.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
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • 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
  • Bot-joining model
  • Team features gated
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • 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.S-tier for solo + free. The best free option, hands down.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier in the agent category. The first one I'd give to a non-technical friend.
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