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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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Claude Agent SDK
S
Devin
A
ChatGPT Operator
B
GitHub Copilot
B
TaglineAnthropic's SDK for building your own agents on Claude.Cognition Labs' autonomous coding engineer.OpenAI's browser agent. Clicks and types on websites for you.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.
CategoryAgentsAgentsAgentsCoding
PricingAPI usage + SDK is free$500/moIncluded with ChatGPT Pro $200/moFree (limited) + $10/mo Pro + $19/mo Business
Best forDevelopers building custom agents for their own company/product.Engineering teams offloading tickets. Ops/platform work.Power users willing to pay $200/mo for a browser bot.Teams with GitHub already. Devs who don't want to change IDEs.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • 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
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
Weaknesses
  • Developer-only
  • You build the UI
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Less agentic than Cursor/Claude Code
  • Model quality varies
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.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.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.
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