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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 Code
S
Claude Agent SDK
S
Devin
A
ChatGPT Operator
B
TaglineAnthropic's CLI agent. Opus-powered, operates on your repo directly.Anthropic'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.
CategoryCodingAgentsAgentsAgents
PricingPart of Claude Pro/Max/Team plansAPI usage + SDK is free$500/moIncluded with ChatGPT Pro $200/mo
Best forDevelopers who want an agent, not autocomplete. Large refactors, tests, docs.Developers 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.
Strengths
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • 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
Weaknesses
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • 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
Kai's verdictS-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-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.
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