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