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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
Claude Agent SDK
S
ChatGPT Operator
B
Devin
A
TaglineRun any open-source AI model with an API call.Anthropic's SDK for building your own agents on Claude.OpenAI's browser agent. Clicks and types on websites for you.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformAgentsAgentsAgents
PricingPay per second of computeAPI usage + SDK is freeIncluded with ChatGPT Pro $200/mo$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers building custom agents for their own company/product.Power users willing to pay $200/mo for a browser bot.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Developer-only
  • You build the UI
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for builders. The right primitives. What Kai is built on under the hood.B-tier. Still early. Manus is more flexible for less money.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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