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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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Bolt.new (StackBlitz)
A
Claude Agent SDK
S
Perplexity
S
ChatGPT Operator
B
TaglinePrompt to deployed full-stack app in the browser.Anthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.OpenAI's browser agent. Clicks and types on websites for you.
CategoryCodingAgentsResearchAgents
PricingFree + $20-$200/moAPI usage + SDK is freeFree + $20/mo ProIncluded with ChatGPT Pro $200/mo
Best forPMs, founders, non-devs shipping MVPs.Developers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictA-tier. Best for fast prototypes. Competitive with Lovable — try both.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Still early. Manus is more flexible for less money.
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