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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
OpenRouter
S
GitHub Copilot
B
Rows
A
TaglineOpen weights + strong photorealism. The open-source answer.One API, every model. Pay-as-you-go, no subscriptions.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Spreadsheets with AI + live integrations baked in.
Categoryimagedev platformcodingdata
PricingAPI + open weights (Schnell is Apache 2.0)Pay per token — model-dependentFree (limited) + $10/mo Pro + $19/mo BusinessFree + $19-$89/user/mo
Best forDevelopers + power users who want control and privacy.Developers experimenting across models. Apps that want fallback logic.Teams with GitHub already. Devs who don't want to change IDEs.Ops teams, marketers, anyone building dashboards from multiple sources.
Strengths
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
Weaknesses
  • Harder to use than hosted tools
  • Needs infra
  • Slight markup over direct API
  • Some provider features not exposed
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
Kai's verdictA-tier. S-tier if you self-host. The reason open-source image gen matters.S-tier for model-shopping. I use this for every prototype before committing.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.
LinkOpen →Open →Open →Open →