Once you're logged in, you'll see a clean interface with a text input box at the bottom. This is where you type your messages — called "prompts" — to ChatGPT.

Starting a Conversation

Simply type something and press Enter. For example:

"What are the three largest oceans in the world?"

ChatGPT will respond with a clear, well-structured answer. You can then ask follow-up questions in the same conversation, and it will remember the context.

Understanding the Interface

• Chat history (left sidebar) — All your previous conversations are saved here. You can rename, delete, or search through them.
• New chat button — Starts a fresh conversation with no prior context.
• Model selector — At the top of a new chat, you can choose which model to use (GPT-4o, GPT-5, etc.).
• Attach files — You can upload images, documents, PDFs, and spreadsheets for ChatGPT to analyze.

Conversation Threads

Each conversation is a "thread" where ChatGPT remembers everything said so far. This is incredibly powerful for iterating on ideas:

1. Ask an initial question
2. Refine the answer by asking follow-ups
3. Request changes like "make it shorter" or "add more detail"
4. Continue building on previous responses

Important: Context Window

ChatGPT can only "remember" a certain amount of text within a single conversation (called the context window). For GPT-4o, this is about 128,000 tokens (~96,000 words). For GPT-5, it's even larger. If a conversation gets very long, older messages may start to drop out of context.

Try It Now

Open ChatGPT and try these starter prompts:

• "Explain quantum computing like I'm 10 years old"
• "Write a haiku about coffee"
• "What's the difference between machine learning and deep learning?"