Free Claude AI ChatEvery Claude Model, One Window
Chat with Claude Haiku 4.5 for free, then switch to Claude Sonnet 5, Claude Opus 5 or Claude Fable 5.1 when the task needs more, in the same conversation. Attach a PDF or a photo and ask Claude about it.
Every Claude Model in One Chat
The Claude family is tiered, and the tiers are good at different things. Here all four are in the same window, and switching between them does not start a new conversation.
Claude Haiku 4.5 is what the chat opens with. It costs nothing a message and has no cap, so the ordinary back-and-forth of a working day never runs a meter.
When the task outgrows Haiku, switch to Sonnet 5, Opus 5 or Fable 5.1 in the same conversation. Claude keeps the context; you are not re-explaining anything to a fresh window.
GPT, Grok and Kimi are in the same menu. Put the same question to two families and compare the answers — the thing a single-assistant site cannot do at all.
Which one for what. Haiku for speed and for most writing; Sonnet when the reasoning matters more than the wait; Opus for long analysis that has to hold together; Fable 5.1 when you want the newest. The table further down says it in more detail.
How to Use Claude Free Without an Account
Three steps, and none of them is a sign-up form.
Use the box on this page, or go to the chat. Claude Haiku 4.5 is the model it opens with.
Write as you would to a person. Claude holds context well, so a follow-up does not need the whole story again.
If the answer needs more thought, switch to Claude Sonnet 5 or Opus 5 in the same conversation. That needs an account, and spends energy rather than money.
Getting better answers out of Claude
- • Say what the answer is for. "For a client email" and "for my notes" produce different drafts.
- • Give it the actual text rather than a description of the text.
- • Ask it to disagree with you; Claude will, and that is where its value shows.
- • Switch to a heavier model for long reasoning, not for longer output.
What Is Claude?
Claude is the family of models made by Anthropic, an American AI company founded in 2021. It is known for careful, measured answers and for holding a long conversation without losing the thread, which is why people reach for it for writing and analysis more than for quick facts.
The family is tiered. Haiku is the fast one, Sonnet the balanced one, Opus the one for work that needs real thinking, and Fable 5.1 the newest. They are the same family and behave alike; what changes is how much thought goes into an answer and how long you wait for it.
On N33 all four are in the same chat window, and so are GPT, Grok and Kimi. Asking one model and then another the same question, in one conversation, is the thing a single-assistant site cannot do.
Which Claude Model for What
Four Claude models are in the chat. Start with the free one and move up when an answer needs more depth. Energy is charged per message.
Cost: Free, no account needed (daily limit for guests)
Speed: The fastest Claude in the chat
Good for: Quick questions, short drafts, rewrites, summaries, everyday chat
Cost: 2 energy per message, with an account
Speed: Balanced speed and depth
Good for: Most serious work: long documents, code, analysis, careful writing
Cost: Opus 5: 5 energy. Fable 5.1: 10 energy. Per message, with an account
Speed: Slower, they take time to reason
Good for: The hardest problems: complex code, multi-step reasoning, long research. Fable 5.1 is the top tier in the chat
What Claude on N33 Can Do
What you can do in the chat today, with any of the four Claude models.
Read PDFsAttach a PDF up to 20 MB and ask for a summary, the key figures, or answers to specific questions. Needs a free account.
Read imagesAttach JPEG, PNG, GIF or WebP images up to 10 MB: screenshots, charts, photos of notes or handwriting. Needs a free account.
Several files at onceUp to 5 files in one message, including text files such as txt, md, csv, json, xml and yaml.
Search the webTurn on the globe toggle and Claude can look things up and cite what it found. Works without an account too.
Write and editEmails, essays, reports, stories and rewrites, in the tone you ask for.
CodeWrite, explain and review code in most languages. The chat does not run the code, so test it yourself.
Switch model mid-chatMove the same conversation to another Claude model, or to GPT or Grok, without starting over.
How Claude Works on N33
Claude is a family of AI models made by Anthropic. N33 is a separate chat service: it is not Anthropic, is not affiliated with Anthropic, and does not give you a claude.ai account. It connects to the Claude models and puts them in one chat window next to GPT and Grok models, so you can compare answers or switch model in the middle of a conversation.
Claude Haiku 4.5 is the default model and works without an account. The larger Claude models need a free account and cost energy per message: a new account starts with 50 energy and can claim 10 more each day. That is enough to try Claude Sonnet 5 on real work, or to send a few messages to Claude Opus 5 when you need its depth. If you mainly want the free route to Claude, the page on Claude Pro for free covers it in detail.
A practical habit: draft with Haiku, then send the hard part to Sonnet or Opus. Since the conversation stays in one place, the larger model sees everything that came before, and you pay energy only for the messages that need it. For documents, see how the chat reads files on the chat with PDF page.
Why Chat with Claude Here
The reasons that hold whether or not you already use claude.ai.
Claude Haiku 4.5 answers with no account and no message cap.
All four Claude models in one window, switchable inside a single conversation.
Claude beside GPT, Grok and Kimi, so the same question can be put to two models and the answers compared.
The heavier Claude models cost energy, which is earned — 50 to start, 10 claimable a day — and cannot be bought.
Images, video, talking avatars and dubbing are in the same workspace, so a chat can become a picture without changing apps.
Is This the Real Claude?
A fair question for any site offering Claude for free. The honest answer, in full.
Claude Haiku 4.5, Sonnet 5, Opus 5 and Fable 5.1 here are Anthropic's own models answering through their interface. Not a copy, not a fine-tune of something else, and not another model given the name.
This is our workspace, not theirs. A claude.ai account, Anthropic's apps, their Projects and their own interface are all separate from this and stay where they are. If that is what you came for, claude.ai is the right place and we will not pretend otherwise.
The models, with no account between you and the free one, in a chat that also holds GPT, Grok and Kimi. For comparing how different models answer the same question, that is the better arrangement. For living inside one assistant's ecosystem, it is not.
Claude AI Chat Questions
About the Claude models on N33.
Yes. Claude Haiku 4.5 answers on N33 with no account, no email and no verification — open the chat and write. Logging in is only needed for attachments, for keeping conversations between visits, and for the heavier Claude models.
Open the chat on this page and send a message; Claude Haiku 4.5 is already selected and costs nothing per message, with no daily cap. Nothing is asked of you first, and no card is involved at any point.
Three things, and they are worth knowing before you start. Attachments need an account, so you cannot send a PDF or an image as a guest. Conversations are not kept between visits without one either. And the heavier models — Sonnet 5, Opus 5, Fable 5.1 — cost energy, which an account gives you 50 of to begin with.
Not for this. It runs in your browser, on a phone the same as on a desktop, and there is nothing to download. Anthropic's own apps are separate and sign in to claude.ai, not to this.
No. Without an account a conversation lives in that browser session and is gone afterwards. If you want your chats to still be there tomorrow, make an account — that is the main thing it buys you, beyond attachments and the heavier models.
No. The official chat is claude.ai, run by Anthropic. N33 is an independent service, not affiliated with Anthropic, that lets you chat with Claude models alongside GPT and Grok models.
Claude Haiku 4.5. It is the default in the chat and works without an account, with a daily limit for guests. Claude Sonnet 5, Claude Opus 5 and Claude Fable 5.1 need an account and energy.
Start with Claude Sonnet 5 (2 energy a message) for most work. Move to Claude Opus 5 (5 energy) when Sonnet's answer is not deep enough: complex code, long multi-step reasoning, difficult analysis.
The top Claude tier in the N33 chat, for the hardest tasks. It costs 10 energy per message, so it makes sense for a few important questions rather than everyday chat.
Yes. With a free account, attach a PDF up to 20 MB, or up to 5 files in one message, and ask Claude about it. All four Claude models read PDFs and images. Word files are not supported, so save them as PDF first.
No. You do not need an Anthropic account for the chat on N33. Claude Haiku 4.5 works with no account at all, and the other models need only a free N33 account.
What People Say
What people say about picking the right Claude model for a task, in their own words.
Convenient for editing, for structuring and for checking ideas. The answers are usually calm and detailed. A good option for working with long texts.
It helped me break down a long document and pull out the main points. I particularly liked how logically the answers are structured. For work tasks it turned out very useful.
I use it to have difficult topics explained in plain words. You can ask follow-up questions and work through it gradually. I would recommend it as a study helper.
By the N33 editorial team · Updated · How we check facts