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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Claude Agent SDK
S
Cursor
S
Devin
A
Cline
A
TaglineAnthropic's SDK for building your own agents on Claude.VS Code fork that made AI coding actually work.Cognition Labs' autonomous coding engineer.Open-source VS Code agent. Reads + writes + runs.
CategoryAgentsCodingAgentsCoding
PricingAPI usage + SDK is freeFree + $20/mo Pro + $40/mo Business$500/moFree (open source) + your API costs
Best forDevelopers building custom agents for their own company/product.Developers. Non-developers who want to ship working code.Engineering teams offloading tickets. Ops/platform work.VS Code users who want agentic coding without changing IDEs.
Strengths
  • 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
  • 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
Weaknesses
  • Developer-only
  • You build the UI
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Can burn tokens fast if not watched
  • Less polished than Cursor
Kai's verdictS-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.A-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.
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