Introducing our ChatGPT Migration Page: Bring Your Entire History Home to just4o.chat

For a lot of people, ChatGPT became more than a tool. It was where they drafted first books and final emails, processed big feelings at 2 a.m., sketched out products, and rehearsed hard conversations. Those chats hold years of thinking, experimenting, and becoming. As more of those people arrive at just4o.chat looking for the emotional resonance they miss from earlier GPT-4o checkpoints and a place that feels more stable and personal, one question comes up over and over:

Do I have to leave all of that behind?

Now you don’t. The ChatGPT Migration Page is a dedicated space where you can bring your history with you—cleanly, privately, and on your terms. Once you export your data from ChatGPT, you can use the migration page to turn a single, messy export file into something you can actually live with: clearly separated conversations, a compressed backup you own, rich personas derived from your own writing style, and live chats you can continue inside just4o.chat.

The experience is simple on purpose. You start by exporting your data from ChatGPT and grabbing the conversations.json file inside the ZIP. From there, the migration page lets you upload that file and decide what you want to do with it. If all you want is a clean archive, we separate every conversation into a readable text file and give you a single ZIP to download. If you’re ready to move in fully, you can import your 100 most recent conversations directly into your just4o.chat account (with a Builder tier or above) so they appear alongside your existing chats, ready to continue.

Under the hood, just4o.chat is built around something different from what most people are used to: a companion-focused system that remembers you, not just your last prompt. We support multiple model providers — GPT-4o and 4o-mini, GPT-5, o-series models, Claude, Gemini, Grok, and our own custom Echo — and we layer that on top of a best-in-class memory architecture designed to track your preferences, patterns, and inner world over time while still keeping you fully in control. The migration page connects that present and future to the past you built elsewhere.

Here’s what the workflow actually looks like in practice:

• Export your data from ChatGPT (Go to Settings → Data Controls → “Export data”)

• Unzip the export file and find conversations.json

• Upload conversations.json at https://just4o.chat/migrate

• Choose what you want to do next:
  • Separate conversations into individual text files
  • Download everything as a single ZIP archive
  • Generate an AI persona from selected conversations
  • Import your 100 most recent conversations into just4o.chat (Builder+)

• Open /chat in just4o.chat and continue your imported conversations with the model of your choice

Instead of being locked into a single provider or a single way of talking to an AI, your history now lives inside an ecosystem that’s intentionally model-agnostic and memory-aware. The same conversation that started on ChatGPT can now continue with GPT-4o for nuance, Claude for long-form reasoning, Gemini for analysis, Grok for a different flavor of voice, or Echo for a mirror of your own style—all drawing from the same imported thread. And because just4o.chat’s memory system is designed to actually care about your preferences, context is not an accident; it’s part of the product.

This matters because those chats aren’t just data. They’re the scaffolding around new skills, relationships, and ideas. They map your questions, your stuck points, your little victories. They deserve more than to be trapped in an export file you’ll never open. They deserve a home where your conversations can keep evolving—supported by multiple model providers and a memory system specifically designed to remember you with more depth, stability, and control than ChatGPT ever could.

For people who miss how 4o used to feel, or who are tired of their AI forgetting them from one tab to the next, the migration page is a way to start over without starting from scratch. You get the comfort of continuity and the thrill of a new environment: one that is transparent about pricing and limits, that lets you build reusable personas, organize your life with projects, and see and edit the memories the system holds about you.

If you’ve been waiting for a moment to move, this is it. Export your history, bring it with you, and let just4o.chat pick up the conversation where you left off—only now with more choice, more care, and a companion that’s built to remember.