Chat with GPT-4o in a focused space

Looking for the warmer GPT-4o conversation?

If what you miss is the easy back-and-forth, creative enthusiasm, or room to talk through an unfinished thought, try that kind of conversation here. Fouro guides GPT-4o toward warm, expressive replies, specific encouragement, and playful collaboration when it fits your request. You can ask for less advice, more detail, or a different tone as you go.

This is Fouro's own response guidance, not a recovered ChatGPT prompt or a promise of identical behavior. A warm answer should still be honest: Fouro should acknowledge uncertainty and disagree when a conclusion is unsupported.

Try a GPT-4o conversation

No account needed. Guest access includes up to 5 requests per UTC day and 10 per UTC month.

What Fouro does

Write a question or describe what you are working through. Fouro sends the text to its configured GPT-4o provider and displays the response in a straightforward chat. You can ask follow-up questions, change direction, and revise the request as you go. There is no model picker: Fouro requests GPT-4o and surfaces an availability error rather than intentionally substituting a different model.

This is a separate product from ChatGPT. Fouro does not reproduce ChatGPT's private prompts, interface, routing, or complete set of tools. It is not made by, affiliated with, or endorsed by OpenAI. The model provider may change availability, so Fouro cannot promise GPT-4o will remain accessible indefinitely.

Why GPT-4o access changed in ChatGPT

OpenAI announced that it would retire GPT-4o from ChatGPT on February 13, 2026. In that January announcement, OpenAI said there were no API changes at the time. That statement described the API situation on the announcement date; it is not a guarantee of current or future access through any particular provider. Fouro depends on its upstream provider for availability. You can read the original OpenAI announcement for the details.

Try it before creating an account

Signed-out visitors can send up to 5 guest chat requests per UTC day and 10 per UTC month, per signed browser installation. Guest requests are not saved to conversation history or Memory. Refreshing or closing the page clears the current guest conversation.Open Fouro and try a guest chat when you are ready.

How guest limits work

A guest allowance is up to 5 requests per UTC day and 10 per UTC month for a signed browser installation. Daily usage resets at midnight UTC, and monthly usage resets on the first day of the UTC month. A request counts once Fouro starts returning an answer, including an answer you choose to stop. These are Fouro product limits; upstream provider availability and service safeguards also apply.

If you reach a guest limit, wait for its reset or sign in for the Free account allowance. Guest prompts and responses are not imported to a new account. Keep any text you want to save somewhere you control before refreshing or closing your guest conversation.

Plans for continued use

A free signed-in account includes up to 10 chat requests per UTC day and 100 per UTC month, plus saved account-scoped conversations and user-controlled Memory. Pro costs $25 USD per month and removes Fouro's product chat-count limits. Operational provider and service limits still apply. Eligible accounts may receive one card-required 7-day trial; $0 is due at signup, then the subscription renews at $25 per month unless canceled before the trial ends. See full plan and cancellation details before choosing.

What a free account adds

With a signed-in Free account, Fouro saves your conversations to your account and lets you manage user-controlled Memory. You can review, edit, or delete saved memories, up to 20 per account. Memory is not a complete transcript: Fouro uses only a compact relevant selection in a chat. Do not save secrets or sensitive details unless you explicitly want Fouro to remember them. Pro adds an account-scoped AI name and custom instructions for signed-in Pro chats; those preferences do not apply to guest or Free chats.

What to expect from the chat

Fouro is text-only. You can paste a passage, question, or code snippet into the composer, but you cannot attach a document or image, ask Fouro to browse the web, or have it run code. For timely facts, open primary sources yourself and verify important answers. Language models can make mistakes, and Fouro is not a substitute for qualified medical, legal, financial, or other professional advice.

Privacy and account features

Guest prompts are processed to answer your request but are not saved in Fouro history or Memory. Signed-in history and saved Memory belong to your account. Requests are processed by OpenRouter and the upstream model provider. Review the Privacy Policy to understand the data involved. Learn how Fouro works, compare plans, or start chatting.