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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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Cursor
S
Groq
S
Sudowrite
S
Devin
A
TaglineVS Code fork that made AI coding actually work.The fastest AI inference in the world. Crazy low latency.AI writing tool built specifically for fiction writers.Cognition Labs' autonomous coding engineer.
CategoryCodingDev PlatformWritingAgents
PricingFree + $20/mo Pro + $40/mo BusinessFree tier + pay-as-you-go API$19-$59/mo$500/mo
Best forDevelopers. Non-developers who want to ship working code.Developers who need sub-100ms LLM responses.Novelists, screenwriters, fiction short-form writers.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for speed. When latency is the product, start here.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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