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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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OpenRouter
S
Claude Code
S
Leonardo.ai
A
Sudowrite
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Gamer + creator image gen with model fine-tuning built in.AI writing tool built specifically for fiction writers.
CategoryDev PlatformCodingImageWriting
PricingPay per token — model-dependentPart of Claude Pro/Max/Team plansFree + $12-$60/mo$19-$59/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Indie game devs, illustrators, anyone training custom style models.Novelists, screenwriters, fiction short-form writers.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
  • Brainstorm, expand, rewrite modes designed for fiction
  • Story Bible for character + plot tracking
  • Understands voice + tone better than generic chatbots
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • General output behind Midjourney
  • Can be overwhelming
  • Pricey for casual use
  • Fiction-only focus — not for business writing
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier for creators training custom looks. B-tier for general use.S-tier for fiction. If you're writing a novel, this beats raw ChatGPT every time.
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