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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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Devin
A
Bolt.new (StackBlitz)
A
Replicate
S
Claude Code
S
TaglineCognition Labs' autonomous coding engineer.Prompt to deployed full-stack app in the browser.Run any open-source AI model with an API call.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
Categoryagentscodingdev platformcoding
Pricing$500/moFree + $20-$200/moPay per second of computePart of Claude Pro/Max/Team plans
Best forEngineering teams offloading tickets. Ops/platform work.PMs, founders, non-devs shipping MVPs.Developers using open-source models (Flux, SDXL, Whisper, etc).Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Best for fast prototypes. Competitive with Lovable — try both.S-tier for open-source model APIs. The default in this space.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
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