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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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Gemini
A
Claude Agent SDK
S
TaglineGoogle's answer. Best integrated with Workspace + free for a lot.Anthropic's SDK for building your own agents on Claude.
CategoryChatbotsAgents
PricingFree + $20/mo Advanced (bundled with 2TB Drive)API usage + SDK is free
Best forAnyone already on Google, research tasks, summarizing long documents.Developers building custom agents for their own company/product.
Strengths
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Developer-only
  • You build the UI
Kai's verdictA-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for builders. The right primitives. What Kai is built on under the hood.
LinkOpen →Open →