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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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GitHub Copilot
B
Replicate
S
Luma Dream Machine
A
Grammarly
A
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Run any open-source AI model with an API call.Smooth, cinematic motion. Image-to-video specialist.Grammar check + tone + AI drafting, everywhere you type.
Categorycodingdev platformvideowriting
PricingFree (limited) + $10/mo Pro + $19/mo BusinessPay per second of computeFree + $10-$500/moFree + $12-$15/mo Premium + team plans
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers using open-source models (Flux, SDXL, Whisper, etc).Photographers animating stills, cinematic b-roll.Non-native English writers, business email, anyone who types a lot.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Best image-to-video in the category
  • Great camera motion control
  • Ray 2 model produces striking shots
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Prompt fidelity below Runway
  • Queue times on free tier
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for open-source model APIs. The default in this space.A-tier. Best for cinematic image-to-video. Pair with Runway for coverage.A-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.
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