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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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Aider
A
Claude Agent SDK
S
DeepSeek
S
TaglineTerminal-based AI pair programmer. Git-aware, model-flexible.Anthropic's SDK for building your own agents on Claude.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
CategoryCodingAgentsChatbots
PricingFree (open source) + whatever API you useAPI usage + SDK is freeFree web + ultra-cheap API (~$0.14/M input tokens)
Best forDevelopers who want open-source tooling with full control.Developers building custom agents for their own company/product.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Developer-only
  • You build the UI
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictA-tier. The right answer if you want open-source + terminal-native + model-agnostic.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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