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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
Devin
A
ChatGPT Operator
B
Manus
S
TaglineRun any open-source AI model with an API call.Cognition Labs' autonomous coding engineer.OpenAI's browser agent. Clicks and types on websites for you.Autonomous AI agent that actually finishes tasks.
Categorydev platformagentsagentsagents
PricingPay per second of compute$500/moIncluded with ChatGPT Pro $200/moFree tier + $39-$199/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Engineering teams offloading tickets. Ops/platform work.Power users willing to pay $200/mo for a browser bot.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
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • 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
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • 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 for the right use case. Not for solo devs. If you manage engineers, try one license.B-tier. Still early. Manus is more flexible for less money.S-tier in the agent category. The first one I'd give to a non-technical friend.
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