ChatGPT Intelligent UI Custom Apps: What They Are and How to Use Them

“Custom apps” from ChatGPT’s Intelligent UI are interactive mini tools (calculators, planners, maps, quizzes, small games) that ChatGPT builds inside a reply when you ask for one, with no code and no setup. Intelligent UI launched with GPT-6 on October 7, 2026, and you use it just by describing the tool you want in a normal chat. The results stay inside that conversation, though: they are not installable apps you can publish or reliably reuse.

Below is what the feature actually does, who has it, how to get good results, and where it falls short. Details are as of November 2026, and OpenAI is still changing the rollout.

What Intelligent UI is

In its GPT-6 announcement, OpenAI describes Intelligent UI as GPT-6 composing responses from text, visuals and interactive elements, and choosing how they fit together based on your question. Instead of a wall of text, you might get a chart with sliders, a map with an itinerary, or a step-by-step widget.

OpenAI’s own examples include a Sunday roast timing plan, a road-trip map, a savings calculator, a bill splitter and a game you can play in the chat. The ChatGPT release notes list calculators, bill splitters and games, and say the model picks the format itself.

That’s why people call these “custom apps.” TechRadar’s hands-on tested six of them. One was a living-room planner where furniture could be dragged and dropped, and the reviewer noted there is no fixed format: you can ask for something specific or let ChatGPT decide how to present the information.

Who can use it

Two caveats here. First, the release notes say Intelligent UI works from Instant through Extra High reasoning, but the Pro reasoning option doesn’t support it. If you have Pro and you’re not seeing interactive answers, check which reasoning level is selected. Second, the sources don’t fully agree on Free and Go. OpenAI’s announcement and the Developer Community post give October 8 as the start date for those plans, but at least one OpenAI help page updated later in October still listed an older model for Free and Go. Your model picker is the real answer for your account.

The Business release notes also say the feature works only on supported clients. If it isn’t showing up in one app, try ChatGPT on the web or update the app.

How to build a custom app with Intelligent UI

You don’t need a special mode or trigger word. GPT-6 can decide on its own to answer with an interactive layout, and you can also ask for one directly.

1. Open ChatGPT and confirm GPT-6 is selected, with a reasoning level from Instant to Extra High (not Pro).
2. Describe the tool, not just the topic. For example: “Build a bill splitter for 5 people with a tip slider from 0 to 25% and a toggle for splitting tax evenly.”
3. Spell out what you’d otherwise leave vague: the decision you’re trying to make, the input data, which controls you want (sliders, dropdowns, toggles), any fixed rules, and what the result should show. Several third-party guides point out that “make it interactive” alone leaves all of that up to the model.
4. Test the controls and check the output by hand on at least one case. If something is off, say exactly what to fix (“the monthly total ignores the deposit; subtract it first”).
5. Copy out anything you need to keep, such as figures, an itinerary or a plan. Don’t count on the app itself surviving (more on that below).

Prompt ideas that suit the format

• A savings or retirement calculator with sliders for age and monthly contribution (TechRadar tested one like this).
• A trip planner that asks you questions and then lays out a day-by-day plan. Android Authority found the trip planner’s question-and-answer flow to be one of the better results.
• An explainer for a tricky concept, such as a probability puzzle, with something you can click through and simulate.
• A cooking timeline that works backward from when you want to eat.

Limitations to know before you rely on it

Reviewers like the idea but are mixed on the execution.

• No persistence. Android Authority built four mini apps and found they can’t store data beyond the session, and there’s no central place to find them again. Its verdict: not ready to replace even simple everyday apps like a travel tracker. The reviewer also joked that the output is mostly tabs, tables and questions, and that “Interactive Answers” would be a more accurate name.
• Accuracy still matters. Visual elements make errors look more polished, not less likely. Coverage of the launch flagged that interactive visuals add new room for hallucinations and that calculations deserve checking. Verify anything financial, medical or legal.
• Usage cost. Some coverage suggests richer responses could use up your message or token allowance faster. OpenAI hasn’t published specific numbers on this, so treat it as a possibility, not a confirmed rule.
• Sensitive data. These are generated interfaces in a brand-new feature. Be careful about typing personal or financial details into forms ChatGPT creates.
• No official API. We found no published developer API for Intelligent UI itself.

Intelligent UI apps vs. real ChatGPT apps

“Custom apps in ChatGPT” can also mean something different: apps that developers build and connect to ChatGPT. That’s a separate system with different requirements, and it’s worth knowing which one you need.

For the developer route, OpenAI’s help article on connecting custom MCP servers covers adding a server by name, a public HTTPS endpoint and authentication settings. In Business and Enterprise workspaces, only admins and owners can publish custom apps. OpenAI has been renaming this area: current docs point to a Plugins menu, while older guides describe a Developer Mode toggle and an Apps settings page. Follow the current help article over older tutorials. The release notes also say that since late September 2026, plugins can show interactive panels, sidebar views and file viewers next to the conversation.

Bottom line

To get a quick, disposable tool such as a calculator, a planner or an interactive explainer, ask GPT-6 in ChatGPT for one and describe the controls you want. It takes seconds and often works well for single-session tasks. For something you’ll come back to, share with a team or connect to real data, Intelligent UI isn’t built for that yet. Look at the Apps SDK route, or a dedicated no-code builder that gives you hosting and storage. Expect both plan access and features to keep shifting through late 2026.