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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Claude Agent SDK
S
Manus
S
ChatGPT Operator
B
Lex
A
TaglineAnthropic's SDK for building your own agents on Claude.Autonomous AI agent that actually finishes tasks.OpenAI's browser agent. Clicks and types on websites for you.Google Docs with an AI collaborator baked in.
CategoryAgentsAgentsAgentsWriting
PricingAPI usage + SDK is freeFree tier + $39-$199/moIncluded with ChatGPT Pro $200/moFree + $12/mo
Best forDevelopers building custom agents for their own company/product.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Power users willing to pay $200/mo for a browser bot.Essays, long-form drafts, thinking on the page.
Strengths
  • 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
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Developer-only
  • You build the UI
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-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.B-tier. Still early. Manus is more flexible for less money.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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