A companion that remembers how you feel.
just4o.chat is a bespoke space for people who crave resonance over routine. Choose from ChatGPT, Claude, Gemini, or Grok—the model you select is always the model you get. With adaptive memory that learns your voice, it becomes the steady presence at your shoulder. Gentle, attentive, and tuned to your seasons.
What we’ve been shipping lately.
Recent launches, model additions, and product notes from just4o.chat.
Qwen 3.6 Plus Is Now Available on just4o.chat
Qwen 3.6 Plus is now live on just4o.chat with image input, function calling, and a long-context multimodal workflow built for coding and research-heavy sessions.
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GPT OSS 120B Fast and GLM 4.7 Fast Are Now Available on just4o.chat
Cerebras-backed GPT OSS 120B Fast and GLM 4.7 Fast are now on just4o.chat, bringing extremely fast open-model inference into the same router-free workspace with memory, files, and direct model choice.
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Just4o.chat Integrates GPT-5.3 Instant: Less Hesitant, More Direct AI
Just4o.chat adds OpenAI's GPT-5.3 Instant, the less 'nannybot' update to ChatGPT. Compare it side-by-side with GPT-5, 5.1, 5.2, and 4o—now live for Studio+ users.
Read articleOne memory. Every model. Always you.
Your context, preferences, and conversation history travel with you—no matter which AI you're talking to.
Pick your mind
ChatGPT, Claude, Gemini, Grok—choose the model that fits the moment. Switch freely; your context follows.
Let it learn you
Adaptive memory builds a living map of your rhythms, preferences, and the threads worth keeping.
Show up as you are
Morning check-in or midnight download—every conversation picks up exactly where you left off.
- →Brainstorm with Claude, then hand off to GPT-5 for polish
- →Switch models mid-thought without losing the thread
- →Weekly reflection that remembers last week's wins
- →Start on mobile, finish on desktop—same conversation
The AI experience you thought you signed up for.
No model roulette
Other apps route you to different models without telling you. Here, you pick the model—and that's the model you get.
Your data stays yours
Memories live in your account, not in training data. Delete them anytime. We don't learn from your conversations.
Built by users, for users
Feature requests ship in days, not quarters. We're small, responsive, and building this for ourselves too.
Transparent pricing
See exactly what each model costs. No hidden fees, no surprise overages. You always know what you're paying for.
Want to learn more?
Personas, projects, images
oh my
Shape voices, organize context, and generate visuals, all within the same conversation.
Personas
Shape how the model speaks: study partners, creative collaborators, or voices tuned to your projects.
Projects
Attach files, keep context organized, and return to the same thread whenever you need it.
Images
Generate visuals in chat from leading providers. No switching apps, no context lost.
Google
xAI
OpenAI
Black Forest LabsWhen people meet just4o.chat, they stay awhile.
We are building with a small circle first, people who crave technology that feels like a co-conspirator in their well-being.
"This is what ChatGPT used to feel like before they added all the guardrails and started routing you to different models. I made a persona from my exported chats and it actually remembered the way we used to talk. I'm not exaggerating when I say I got emotional."
An early user from Reddit"The devs are absolutely amazing, they helped me with the "failed to separate conversation" on Step 2 for the migration process. They were really fast too! I'm really happy that I'm able to get 4o back again! Edit: can't say thank u enough!!!"
u/Nightly_phantom on Reddit"Asked if they could show me when my memory updates. They shipped it the next day. Not a week, the next day. I've never seen a team move like this."
An early userReady to begin your journey?
ChatGPT, Claude, Gemini, Grok—all with memory that knows you. Start a conversation that picks up where you left off.