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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
Reflect
A
Groq
S
Windsurf
A
TaglineCognition Labs' autonomous coding engineer.AI-powered networked notes. Roam with a brain.The fastest AI inference in the world. Crazy low latency.Codeium's agentic IDE. Cascade agent + strong free tier.
CategoryAgentsProductivityDev PlatformCoding
Pricing$500/mo$10/moFree tier + pay-as-you-go APIFree + $15/mo Pro
Best forEngineering teams offloading tickets. Ops/platform work.Knowledge workers + thinkers who want AI in their second brain.Developers who need sub-100ms LLM responses.Developers who want Cursor-like power for less money.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Expensive for just notes
  • Smaller community than Obsidian
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Smaller community
  • Model selection more limited
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Niche but beloved. If you've outgrown Notion, try this.S-tier for speed. When latency is the product, start here.A-tier. Close second to Cursor. If $5/mo matters, start here.
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