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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
Cline
A
Flux (Black Forest Labs)
A
ChatGPT Operator
B
TaglineCognition Labs' autonomous coding engineer.Open-source VS Code agent. Reads + writes + runs.Open weights + strong photorealism. The open-source answer.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsCodingImageAgents
Pricing$500/moFree (open source) + your API costsAPI + open weights (Schnell is Apache 2.0)Included with ChatGPT Pro $200/mo
Best forEngineering teams offloading tickets. Ops/platform work.VS Code users who want agentic coding without changing IDEs.Developers + power users who want control and privacy.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Harder to use than hosted tools
  • Needs infra
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Best free agentic option in VS Code. Use with Claude for best results.A-tier. S-tier if you self-host. The reason open-source image gen matters.B-tier. Still early. Manus is more flexible for less money.
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