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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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Agents
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Claude Code
S
Replit Agent
A
Gemini
A
Claude Agent SDK
S
TaglineAnthropic's CLI agent. Opus-powered, operates on your repo directly.Replit's AI that builds + deploys full apps on their platform.Google's answer. Best integrated with Workspace + free for a lot.Anthropic's SDK for building your own agents on Claude.
CategoryCodingCodingChatbotsAgents
PricingPart of Claude Pro/Max/Team plans$10-$25/mo Core/TeamsFree + $20/mo Advanced (bundled with 2TB Drive)API usage + SDK is free
Best forDevelopers who want an agent, not autocomplete. Large refactors, tests, docs.Teachers, students, prototypers, hackathon builders.Anyone already on Google, research tasks, summarizing long documents.Developers building custom agents for their own company/product.
Strengths
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • 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
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Developer-only
  • You build the UI
Kai's verdictS-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. Best for teaching a kid to code in 2026.A-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.
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