AI 101

Cloud vs local

Same model, two very different deals — cost, privacy, quality and speed, compared honestly so you can pick per task.

By the end of this page, you'll have a one-line rule for "cloud or local?" — and the numbers behind it.

The one-sentence version

  • Cloud = rent the biggest brain, pay per thought, your data leaves the building.
  • Local = keep the brain in your RAM, pay once, your data stays.

Everything below is just making that sentence precise.

The real cost comparison

Cloud pricing is per million tokens. A 2,000-token prompt plus a 500-token answer at $3/M in and $15/M out costs you about $0.011 per call. Multiply by usage and the bill becomes very real — but notice: for occasional use, cloud is cheaper than any laptop you’d buy.

Local pricing is different: a one-time hardware cost (or the machine you already have), then energy. A 7B model at Q4 quantization needs roughly 4–5 GB of RAM to run — which is inside a normal laptop. The catch is the ceiling: the best local models are still well behind the frontier cloud ones.

Dimension☁️ Cloud🏠 Local
Upfront cost~$0Hardware (or existing)
Per-use costPriced per token~Energy only
PrivacyYour data goes to the providerStays on your machine
Top qualityFrontier models, huge contextBest-in-class 7–14B quantized
LatencyNetwork + queueYour GPU/CPU only
OfflineNoYes — trains, flights, basement
CeilingVery highLower, but improving fast

Where each one actually wins

Cloud wins when: you need the best answer (hard reasoning, long documents, code review), you’re building a product, or you’d rather not think about GPUs.

Local wins when: privacy is non-negotiable (legal, medical, personal), you’re offline a lot, you’re doing high-volume simple work (classification, extraction, drafts), or you just want to tinker with the model itself — which is where the interesting learning happens.

The honest middle path

Most productive setups in 2026 are hybrid: local for the boring 80% (summarize, extract, tag, first drafts), cloud for the hard 20% (reasoning, long context, final polish). The model is interchangeable — the same prompt, two runtimes — which is exactly why learning to think in terms of tasks, not models is the most durable skill on this page.

Watch out: "local" on a laptop and "local" on a data center are different animals. A 70B model at Q4 needs ~40 GB of RAM — that's a workstation, not a MacBook. Check the model size against your RAM *before* you download.
Try it: run the same simple task (summarize a 1-page article) in the cloud and locally. Compare quality, speed, and cost-per-run. Three minutes of setup, and you'll *feel* the tradeoff instead of theorizing about it.