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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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DeepSeek
S
ChatGPT Operator
B
Devin
A
NotebookLM
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.OpenAI's browser agent. Clicks and types on websites for you.Cognition Labs' autonomous coding engineer.Google's research notebook. Turns your docs into a podcast.
CategoryChatbotsAgentsAgentsResearch
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Included with ChatGPT Pro $200/mo$500/moFree
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Power users willing to pay $200/mo for a browser bot.Engineering teams offloading tickets. Ops/platform work.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • 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
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Google-only
  • Can be slow on large corpora
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.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.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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