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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
Claude Agent SDK
S
Cursor
S
TaglineCognition Labs' autonomous coding engineer.The fastest AI inference in the world. Crazy low latency.Anthropic's SDK for building your own agents on Claude.VS Code fork that made AI coding actually work.
CategoryAgentsDev PlatformAgentsCoding
Pricing$500/moFree tier + pay-as-you-go APIAPI usage + SDK is freeFree + $20/mo Pro + $40/mo Business
Best forEngineering teams offloading tickets. Ops/platform work.Developers who need sub-100ms LLM responses.Developers building custom agents for their own company/product.Developers. Non-developers who want to ship working code.
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
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Developer-only
  • You build the UI
  • Can feel overwhelming for non-coders
  • Expensive at scale
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 builders. The right primitives. What Kai is built on under the hood.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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