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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 Code
S
Groq
S
Claude Agent SDK
S
Lex
A
TaglineAnthropic's CLI agent. Opus-powered, operates on your repo directly.The fastest AI inference in the world. Crazy low latency.Anthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.
CategoryCodingDev PlatformAgentsWriting
PricingPart of Claude Pro/Max/Team plansFree tier + pay-as-you-go APIAPI usage + SDK is freeFree + $12/mo
Best forDevelopers who want an agent, not autocomplete. Large refactors, tests, docs.Developers who need sub-100ms LLM responses.Developers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.
Strengths
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for speed. When latency is the product, start here.S-tier for builders. The right primitives. What Kai is built on under the hood.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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