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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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Groq
S
Sudowrite
S
Cursor
S
Devin
A
TaglineThe fastest AI inference in the world. Crazy low latency.AI writing tool built specifically for fiction writers.VS Code fork that made AI coding actually work.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformWritingCodingAgents
PricingFree tier + pay-as-you-go API$19-$59/moFree + $20/mo Pro + $40/mo Business$500/mo
Best forDevelopers who need sub-100ms LLM responses.Novelists, screenwriters, fiction short-form writers.Developers. Non-developers who want to ship working code.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • 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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Pricey for casual use
  • Fiction-only focus — not for business writing
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-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.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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