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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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DeepSeek
S
Replicate
S
GitHub Copilot
B
Sudowrite
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Run any open-source AI model with an API call.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.AI writing tool built specifically for fiction writers.
Categorychatdev platformcodingwriting
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Pay per second of computeFree (limited) + $10/mo Pro + $19/mo Business$19-$59/mo
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers using open-source models (Flux, SDXL, Whisper, etc).Teams with GitHub already. Devs who don't want to change IDEs.Novelists, screenwriters, fiction short-form writers.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Pricey for casual use
  • Fiction-only focus — not for business writing
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for open-source model APIs. The default in this space.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.
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