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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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ChatGPT Operator
B
Claude Agent SDK
S
Manus
S
Devin
A
TaglineOpenAI's browser agent. Clicks and types on websites for you.Anthropic's SDK for building your own agents on Claude.Autonomous AI agent that actually finishes tasks.Cognition Labs' autonomous coding engineer.
CategoryAgentsAgentsAgentsAgents
PricingIncluded with ChatGPT Pro $200/moAPI usage + SDK is freeFree tier + $39-$199/mo$500/mo
Best forPower users willing to pay $200/mo for a browser bot.Developers building custom agents for their own company/product.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Developer-only
  • You build the UI
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictB-tier. Still early. Manus is more flexible for less money.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier in the agent category. The first one I'd give to a non-technical friend.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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