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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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Flux (Black Forest Labs)
A
Leonardo.ai
A
GitHub Copilot
B
OpenRouter
S
TaglineOpen weights + strong photorealism. The open-source answer.Gamer + creator image gen with model fine-tuning built in.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.One API, every model. Pay-as-you-go, no subscriptions.
CategoryImageImageCodingDev Platform
PricingAPI + open weights (Schnell is Apache 2.0)Free + $12-$60/moFree (limited) + $10/mo Pro + $19/mo BusinessPay per token — model-dependent
Best forDevelopers + power users who want control and privacy.Indie game devs, illustrators, anyone training custom style models.Teams with GitHub already. Devs who don't want to change IDEs.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • Train your own models on your style/character
  • Great for game art + concept art
  • Generous free tier
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Harder to use than hosted tools
  • Needs infra
  • General output behind Midjourney
  • Can be overwhelming
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictA-tier. S-tier if you self-host. The reason open-source image gen matters.A-tier for creators training custom looks. B-tier for general use.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →Open →