Claude Code is Claude pointed at your whole project instead of a snippet you paste into a chat box. It reads your files, proposes a plan, waits for you to approve it, then writes, edits and tests the code itself until the thing works.
Claude Code vs ChatGPT: what is the difference?
Before it existed, the workflow was copy and paste. A developer dropped a fragment of their codebase into ChatGPT or the Claude web app, asked for a change, and pasted the answer back into their editor. Then did it again. The model only ever saw the fragment, never the codebase, so the human carried the context back and forth by hand. Pasting a snippet is quoting a roof from one photo of one corner.
The difference shows up before you have asked anything. Claude Code reads the project as it starts, so the context window is already filled by the time you type your first message. ChatGPT opens empty every session and stays empty until you paste something in.
| Chatbot with pasted code | Claude Code |
|---|---|
| Sees the snippet you paste | Reads the project before your first message |
| Returns code into the chat | Writes and edits the files directly |
| You run it and find out what broke | It runs and tests until the code works |
| One answer per question | Loops on the objective until the job is done |
Is Claude Code an agent?
Yes, on the standard definition of an agent: a language model that takes actions because it loops around an objective rather than answering once and stopping. The loop runs read the codebase, come up with an approach, shape the plan with you, get your approval, then write and edit code and keep testing until it works. Codex from OpenAI sits in the same category, and the two get compared head to head in their own lesson.
The approval step is the one to pay attention to. Nothing gets written until you say so.
Do you have to use the terminal?
Not any more. At launch the terminal was the only option, which is the part that scares off non-technical founders. Today it is one of six places the same tool runs.
| Where it runs | What it is |
|---|---|
| Terminal | The CLI it launched with |
| VS Code | The editor most developers write code in |
| Cursor | Another editor, with Claude Code available inside it |
| JetBrains | Same again, for JetBrains editors |
| Claude Cowork | The desktop app |
| Web app | Claude Code running in the cloud |
The demo starts after setup, and from there it is one word. You type claude in
the folder you want it working on, it comes up, it has already read what is in
there, and you ask it something like what is this codebase about. No paste, no
upload.
Everything after that runs through slash commands, and it tells you what they
are as you go. Two of them matter on day one. /help prints the full list.
/model switches which model you are on, and that switch is about cost: Fable 5
is the expensive one, so on something simple you move to Sonnet 5 and stop
paying Fable 5 rates for a question that does not need it. You can also ask for
more effort in plain English, “please use max effort”, and it thinks harder
before it acts. Effort has its own lesson, and
what any of it does to your bill is
subscription versus usage.
Can you use Claude Code if you cannot code?
The folder in the demo is not a codebase at all. It is a set of project files. The first question asked of it is what it would take to build a newspaper website, followed by what tech stack to use for one.
Most of the early value is educational. There are no dumb questions here, and nobody is watching you ask them. Ask it to teach you, step by step, how to build a site and how to host it. Ask what a login and registration system would take and which tools do that job best. Ask what the whole thing will cost to run, and what happens if a lot of people show up on it at once.
Swap the newspaper for your own version and the questions hold. What would it take to let a homeowner log in and see photos of the finished install? Which tool handles that login? What does it cost to run in a quiet month, and what happens on the first of the month when every tenant signs in to pay rent at once? If you run a solar or property-management business and have been handed a quote for internal software you did not understand, those are the questions that make the quote readable.