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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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S
Claude
S
Windsurf
A
ChatGPT Operator
B
TaglineRun any open-source AI model with an API call.Anthropic's flagship — best reasoning + longest useful context.Codeium's agentic IDE. Cascade agent + strong free tier.OpenAI's browser agent. Clicks and types on websites for you.
Categorydev platformchatcodingagents
PricingPay per second of computeFree + $20/mo Pro + team/enterpriseFree + $15/mo ProIncluded with ChatGPT Pro $200/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Long writing, code, careful thinking, documents over 50 pages.Developers who want Cursor-like power for less money.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Image generation is weak
  • No native web search on all tiers
  • Smaller community
  • Model selection more limited
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.A-tier. Close second to Cursor. If $5/mo matters, start here.B-tier. Still early. Manus is more flexible for less money.
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