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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
Leonardo.ai
A
Lex
A
TaglineRun any open-source AI model with an API call.The fastest AI inference in the world. Crazy low latency.Gamer + creator image gen with model fine-tuning built in.Google Docs with an AI collaborator baked in.
CategoryDev PlatformDev PlatformImageWriting
PricingPay per second of computeFree tier + pay-as-you-go APIFree + $12-$60/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers who need sub-100ms LLM responses.Indie game devs, illustrators, anyone training custom style models.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • General output behind Midjourney
  • Can be overwhelming
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for speed. When latency is the product, start here.A-tier for creators training custom looks. B-tier for general use.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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