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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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Devin
A
ChatGPT Operator
B
DeepSeek
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.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
Categorydev platformagentsagentschat
PricingPay per second of compute$500/moIncluded with ChatGPT Pro $200/moFree web + ultra-cheap API (~$0.14/M input tokens)
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.Developers + cost-conscious builders. Anyone fine with self-hosting.
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
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
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
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
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 for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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