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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
Sudowrite
S
Groq
S
Devin
A
TaglineVS Code fork that made AI coding actually work.AI writing tool built specifically for fiction writers.The fastest AI inference in the world. Crazy low latency.Cognition Labs' autonomous coding engineer.
CategoryCodingWritingDev PlatformAgents
PricingFree + $20/mo Pro + $40/mo Business$19-$59/moFree tier + pay-as-you-go API$500/mo
Best forDevelopers. Non-developers who want to ship working code.Novelists, screenwriters, fiction short-form writers.Developers who need sub-100ms LLM responses.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
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • 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
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • 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 fiction. If you're writing a novel, this beats raw ChatGPT every time.S-tier for speed. When latency is the product, start here.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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