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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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Claude Agent SDK
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OpenRouter
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TaglineVS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.One API, every model. Pay-as-you-go, no subscriptions.
Categorycodingagentsdev platform
PricingFree + $20/mo Pro + $40/mo BusinessAPI usage + SDK is freePay per token — model-dependent
Best forDevelopers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • 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
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictS-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.S-tier for model-shopping. I use this for every prototype before committing.
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