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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
TaglineRun any open-source AI model with an API call.One 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.
Categorydev platformdev platformcodingimage
PricingPay per second of computePay per token — model-dependentPart of Claude Pro/Max/Team plansFree + $12-$60/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers 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.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 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
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • 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
Kai's verdictS-tier for open-source model APIs. The default in this space.S-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.
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