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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
Groq
S
Cursor
S
Claude Agent SDK
S
TaglineCognition Labs' autonomous coding engineer.The fastest AI inference in the world. Crazy low latency.VS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.
CategoryAgentsDev PlatformCodingAgents
Pricing$500/moFree tier + pay-as-you-go APIFree + $20/mo Pro + $40/mo BusinessAPI usage + SDK is free
Best forEngineering teams offloading tickets. Ops/platform work.Developers who need sub-100ms LLM responses.Developers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for speed. When latency is the product, start here.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for builders. The right primitives. What Kai is built on under the hood.
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