ChatGPT free online · no sign-up
Open the chat and start typing: no account, no card, nothing to install. When you want better answers, this guide explains how the GPT-6 models work, which one suits which job, and how to write prompts that get you there.
Think of ChatGPT as a well-read companion who never tires of questions. It drafts, explains, translates, summarises and reasons through problems in plain language, and it adjusts when you push back. It is not a search engine and it is not an oracle. It is a conversation partner that happens to be very good with words, code and structure.
The trick is to treat every answer as a first draft. Ask a follow-up, add context, request a different format. Most of the value shows up in the second and third turns, not the first.
You
I have an interview on Friday for a junior data analyst job. Can you help me prepare?
ChatGPT
Gladly. Let’s do three things: I’ll list the questions analysts are asked most often, we’ll shape a short story from your experience for each one, and then I’ll play the interviewer so you can practise out loud. First, which tools have you used: Excel, SQL, Python?
You
Mostly Excel, and a bit of SQL.
ChatGPT
That covers what most junior roles ask for. Here’s a two-minute SQL warm-up you can try right now…
From tax forms to quantum tunnelling, at whatever level you ask for — and again, more simply, if the first try doesn’t land.
Emails, cover letters, essays and product copy. It drafts quickly and edits to your tone, length and audience.
Writes functions, explains error messages, reviews diffs and translates between languages such as Python, SQL and TypeScript.
Paste a report, a contract or meeting notes and get the key points, open questions and next steps.
Trip itineraries, study schedules, project plans, pros and cons laid out so you can make the call.
Natural translation across dozens of languages, plus patient conversation practice with gentle corrections.
Treat the first answer as a draft, not a verdict. ChatGPT gets noticeably better the moment you tell it what you actually need.
In September 2026 OpenAI released three GPT-6 models. All three read up to 1.05 million tokens at once and accept text, images and files. They differ in depth, speed and price.
The flagship
For deep research and long, careful work
The one to reach for when the work is long and the stakes are high: deep research, careful analysis, large codebases and multi-step projects.
Read the GPT-6 Astra notesThe all-rounder
High-end quality at a sensible price
Much of Astra’s polish at a fifth of the price. A strong everyday choice for serious writing, coding and analysis that has to scale.
Read the GPT-6 Sol notesThe sprinter
Fast, light and very cheap
Built for speed and volume: quick chats, sorting and tagging, pulling data out of text and lightweight agents, at a price measured in cents.
Read the GPT-6 Luna notesA note about this site: the free chat on chagpt.org is powered by OpenAI’s GPT-6 Luna, the fast tier of the current GPT-6 generation. Its low price is what lets us keep the chat free for everyone. More about GPT-6 Luna
Compare all modelsEach guide is a short, practical playbook with prompts you can copy. Open one, try a prompt in the chat, then adjust it to taste.
Understand hard topics, plan revision and practise for exams, without outsourcing the thinking.
Open the guide
Debug faster, write tests, review diffs and make sense of unfamiliar code.
Open the guide
Get past the blank page, tighten drafts and test headlines, in your own voice.
Open the guide
Emails, meeting notes, research briefs and plans, done faster and with fewer rewrites.
Open the guideSpecs are only part of the story, but they are the part anyone can check. Here is the GPT-6 line-up next to the latest models from Anthropic, Google, SpaceXAI and DeepSeek.
| Model | Maker | Released | Context window | Price in / out, per 1M tokens | Details |
|---|---|---|---|---|---|
| GPT-6 Astra | OpenAI | Sep 4, 2026 | 1.05M | $10 / $50 | Model notes |
| GPT-6 Sol | OpenAI | Sep 22, 2026 | 1.05M | $2 / $10 | Model notes |
| GPT-6 Luna | OpenAI | Sep 22, 2026 | 1.05M | $0.10 / $0.50 | Model notes |
| Claude Opus 5.5 | Anthropic | Sep 22, 2026 | 1M | $4 / $20 | ChatGPT vs Claude |
| Gemini 3.8 Flash | Sep 2, 2026 | 1M | $0.75 / $3.75 | ChatGPT vs Gemini | |
| Grok 4.7 | SpaceXAI | Sep 21, 2026 | 500K | $1.60 / $4.80 | ChatGPT vs Grok |
| DeepSeek V4.1 Flash | DeepSeek | Sep 10, 2026 | 1M | $0.15 / $0.60 | ChatGPT vs DeepSeek |
Tap “Free chat”. There is nothing to sign up for and nothing to install. It works in any modern browser, on a phone or a laptop.
Describe the task, who it is for and what a good result looks like. One sentence of context beats a paragraph of politeness.
Ask for changes: shorter, friendlier, as a table, with another example. Keep going until it is right, then copy the result.
The short version of what readers ask us most. The full FAQ goes deeper on privacy, limits and models.
Yes. The chat on chagpt.org is free, with no subscription, no card and no trial period. To keep it that way for everyone, there are fair-use limits on how many messages one network can send per minute and per day.
No. Open the chat and start typing. There is no account to create and no email to confirm. Your conversation is saved in your own browser, so you can carry on later on the same device.
No. chagpt.org is an independent website, not affiliated with or endorsed by OpenAI. Our chat uses OpenAI’s GPT models through the official API, so the answers come from a genuine GPT model, but the site itself is not OpenAI’s ChatGPT app.
OpenAI’s GPT-6 Luna, the fast tier of the current GPT-6 generation. We chose it because it answers well and quickly at a cost low enough to keep the chat free. It is not GPT-6 Astra or Sol, the larger models in the family.
Yes. The site is available in 18 languages, and the chat replies in whatever language you write in, from Russian and Spanish to Arabic, Chinese, Japanese and many more.
Yes. The chat runs in any modern mobile browser with nothing to download. You can also add the site to your home screen for quicker access.
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