ChatGPT by OpenAI is the most widely used AI assistant in the world, with over 200 million active users. GPT-5.5 combines advanced reasoning, image understanding, code generation, and web search in one interface.
Access to OpenAI's most powerful model without paying. The free tier includes GPT-5.5 with daily usage limits — after which it falls back to GPT-4.5, which is still very capable for most tasks.
Generate photorealistic and artistic images from text prompts directly in the chat. Supports 1:1, 16:9, and portrait aspect ratios. Free users get limited generations; Plus users get ~50/day.
ChatGPT can remember facts about you — your job, writing style, preferences — and apply them in future conversations. You can view, edit, or delete any memory at any time from Settings.
Build your own specialized AI assistant with custom instructions, uploaded knowledge files, and API connections — no code required. Thousands of community GPTs are available in the GPT Store.
ChatGPT uses Bing to search the web when you ask about current events, recent news, or any information beyond its training cutoff. Search is automatic — it decides when it needs to look things up.
Upload spreadsheets, CSV files, or code and ask ChatGPT to analyze data, create charts, run Python code, and find insights. The code runs in a secure sandbox and outputs visual results directly in chat.
Go to chat.openai.com → Sign up with Google, Microsoft, or email. The Free plan gives access to GPT-5.5 with daily limits. For professional use, ChatGPT Plus ($20/mo) is required — unlimited GPT-5.5, DALL·E 3 images, and Code Interpreter Python sandbox.
After signup, select GPT-5.5 in the model selector at the top. This is the highest-capability model. If you hit rate limits, GPT-4.5 is the fallback.
Go to chatgpt.com/gpts → Create → Configure. Fill in:
Name: 'SEO Content Writer'
Instructions:
'You are an expert SEO content writer. When given a topic: 1) Ask for target keyword and audience if not provided. 2) Create H1 title with keyword in first 60 characters. 3) Write 1,500 words with H2 every 300 words. 4) Include a 155-character meta description. 5) End with a CTA. Tone: professional but accessible. Never use jargon.'
Click Create. Your GPT is live at a shareable URL. Test it immediately — paste a blog topic and verify it follows your instructions.
Use this framework for any task:
[ROLE] You are a [expert type] with [X years] experience in [domain]. [CONTEXT] [Your situation, audience, constraints] [TASK] [Exactly what you need] [FORMAT] Output as [bullet list / table / JSON / paragraphs] [CONSTRAINTS] Max [X] words. Avoid [specific things].Example cold email prompt:
Enable Code Interpreter: select GPT-5.5 → the code icon appears automatically. Upload any CSV or Excel file and try:
'Analyze this sales data. 1) Calculate total revenue by region. 2) Find the top 5 products by revenue. 3) Plot a monthly revenue trend bar chart. 4) Identify the month with the highest growth rate and suggest why. 5) Export a summary table as Excel.'
ChatGPT writes Python, executes it live, shows output, and lets you download the result. You can ask it to modify any part iteratively.
In any ChatGPT Plus chat, type directly:
'Generate a series of 4 product photos for [product name]. Consistent style: white background, soft studio lighting from upper-left, product centered with slight shadow, 85mm lens, commercial photography. Generate: 1) straight-on hero shot, 2) 45-degree angle, 3) close-up detail, 4) lifestyle context. Photorealistic, commercial quality.'
After generation, iterate: 'Regenerate image 3 but change the background to warm wood texture.' DALL·E maintains the style across iterations. Right-click → Save. All images are commercially usable on paid plans.
Go to Settings → Personalization → Memory → turn on. Then tell ChatGPT what to remember:
'Remember: I am a [role] at [company type]. My goals are [goals]. Preferred output format: [format]. Always [rule]. Never [rule].'
For a system-wide persona, go to Settings → Personalization → Custom Instructions and fill both fields. This applies to every new conversation automatically.
GPT Actions connect your Custom GPT to external APIs. In your Custom GPT → Add actions → Schema. Example schema for a weather API:
openapi: 3.0.0
info:
title: Weather API
version: 1.0
paths:
/weather:
get:
operationId: getCurrentWeather
parameters:
- name: city
in: query
schema:
type: stringPaste the schema, set the server URL, add your API key in Authentication. Your GPT can now fetch live data when a user asks. This is the foundation for AI-powered products built on top of ChatGPT.