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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
OpenRouter
S
ChatGPT
S
Perplexity
S
TaglineCognition Labs' autonomous coding engineer.One API, every model. Pay-as-you-go, no subscriptions.The default. Strongest ecosystem + best multimodal breadth.AI search done right. Cited answers, not chat theater.
CategoryAgentsDev PlatformChatbotsResearch
Pricing$500/moPay per token — model-dependentFree + $20/mo Plus + $200/mo ProFree + $20/mo Pro
Best forEngineering teams offloading tickets. Ops/platform work.Developers experimenting across models. Apps that want fallback logic.General use, voice chat, image generation, first-time AI users.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Great voice mode
  • Huge plugin/custom GPT ecosystem
  • Strong image generation (DALL-E built in)
  • Code Interpreter
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Slight markup over direct API
  • Some provider features not exposed
  • Reasoning quality varies by mode
  • Can be verbose
  • Confabulates on niche facts
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for model-shopping. I use this for every prototype before committing.S-tier all-rounder. If you want one tool that does everything okay-to-great, this is it.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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