A great prompt on a weak model still gives you a weak answer. Which model you use decides what everything else can become.
~5 min · Foundations
Definition
What a frontier model is
A frontier model is the newest, most capable model a lab has released. The front of the line.
Every lab ships a range: small and fast and cheap, up to large and slower and smartest. The frontier one is the smartest.
"Frontier" keeps moving. Today's frontier model is next year's baseline. The names change every few months. The idea doesn't.
Free vs. frontier
Why the tier matters
Free models are usually outdated: an older or smaller version, a step or two behind the current frontier.
An outdated model is bland, shallow, and more likely to be wrong. A lot of AI underwhelm starts right here.
The gap from a free model to a frontier model is not a small upgrade. It's the difference between a clever intern and a sharp senior operator.
Going paid is well worth it. You can't judge what AI can really do until you've seen it run on a frontier model.
Beyond quality
It's not just the model
Free costs you more than quality. It also locks out the things that make AI actually useful downstream:
Connections to your tools. Paid tiers let the AI plug into what you already use: email, calendar, Drive, Slack, Notion. That's where it stops being a chat box and starts doing real work. Most of these are gated behind paid.
Plugins and skills. The add-ons that extend what the AI can do, and the ability to build your own, are largely paid-only.
Bigger inputs and web access. Uploading large files, working across long documents, and live web search are limited or off on free.
You get cut off. Free plans cap how much you can do. Hit the limit and you're locked out, waiting for it to reset, usually right in the middle of something. The technical term is "running out of tokens." In practice, the chat just stops and you wait.
Bottom line
The paid tier is the price of admission
Around $20 a month is the price of admission. It's the cost of seeing what this actually does.
Frontier models sit behind the paid tier. The free tier is most of the reason you were underwhelmed.
This is the one place we tell you to spend before you start. Everything else in the program assumes you're on it.
The landscape
The landscape
The program teaches on Claude. Everything we teach has an equivalent in the other major tools, so if you're committed to one of them, you can follow along. Get on the paid tier of whichever you choose.
Vendor
The tool
The paid tier you want
Anthropic
Claude
Claude Pro
OpenAI
ChatGPT
ChatGPT Plus
Google
Gemini
Google AI Pro
Microsoft
Copilot
Microsoft 365 Premium
Current flagships, mid-2026: Claude Opus, OpenAI's GPT-5.5, Google's Gemini 3.1 Pro. There are also heavy-use tiers ($100 to $200 a month, like Claude Max and ChatGPT Pro). You don't need those to start. The standard ~$20 plan is the right call.
What's next
Up next
Getting Set Up
You've picked a frontier model and a paid tier. Next, get into the tool and through your first real interaction.