---
title: "ChatGPT Apps SDK and the Super App Reform: How Apps in ChatGPT Work (2026)"
slug: "chatgpt-apps-sdk-super-app-guide"
description: "The ChatGPT Apps SDK explained: how apps in ChatGPT work, why it's built on MCP, who the launch partners are, and how developers build and submit apps."
publishDate: "2026-07-11"
author: Umesh Malik
canonical: "https://umesh-malik.com/blog/chatgpt-apps-sdk-super-app-guide"
category: "AI Engineering"
tags:
- AI
- OpenAI
- ChatGPT
- Apps SDK
- MCP
- AI Agents
- Developer Tools
keywords: "ChatGPT Apps SDK, apps in ChatGPT, ChatGPT super app, ChatGPT app directory, Apps SDK MCP, build ChatGPT app, ChatGPT app submission, ChatGPT redesign 2026, Model Context Protocol apps"
primaryKeyword: ChatGPT Apps SDK
secondaryKeywords:
- apps in ChatGPT
- ChatGPT super app
- ChatGPT App Directory
- Apps SDK MCP
- build a ChatGPT app
- ChatGPT app submission
geoHooks:
- TL;DR
- What is the Apps SDK
- How apps in ChatGPT work
- How to build one
- FAQ
image: "/blog/chatgpt-apps-sdk-cover.svg"
imageAlt: "ChatGPT super app reform showing the Apps SDK built on MCP with inline app UIs and the App Directory"
featured: true
published: true
readingTime: "7 min read"
faq:
  - q: "What is the ChatGPT Apps SDK?"
    a: "The Apps SDK is OpenAI's developer toolkit for building apps that run inside ChatGPT. It builds on the Model Context Protocol (MCP): your app is an MCP server that exposes tools and points each tool to an optional web UI component, which ChatGPT renders inline in the conversation."
  - q: "How do apps in ChatGPT work?"
    a: "You write an MCP server that lists tools, executes tool calls, and returns widgets. The model picks a tool based on the user's intent, calls it, and ChatGPT renders your UI inside a sandboxed iframe. The UI talks to ChatGPT over a JSON-RPC bridge (postMessage) and can request inline, picture-in-picture, or fullscreen display."
  - q: "Who were the launch partners for apps in ChatGPT?"
    a: "Pilot partners included Booking.com, Canva, Coursera, Figma, Expedia, Spotify, and Zillow. Apps are available to logged-in ChatGPT users outside the EEA, Switzerland, and the UK on Free, Go, Plus, and Pro plans."
  - q: "How do I submit an app to ChatGPT?"
    a: "Build your app's MCP server with the Apps SDK, then submit it through OpenAI's app submission portal. Apps that meet OpenAI's quality and safety standards can be listed in the ChatGPT App Directory, making them discoverable and shareable."
---

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OpenAI just turned ChatGPT into a platform — and the **ChatGPT Apps SDK** is how developers ship to it. The company stopped treating ChatGPT as a chatbot and started treating it as an **operating system**.

The 2026 reform — a "super app" redesign reportedly codenamed **Aria** — folds AI agents, the Codex coding tool, image generation, and a growing catalog of **third-party apps** directly into the main ChatGPT interface. For its ~900 million weekly users, the chat box is becoming a launcher: you ask for a playlist and Spotify renders inside the conversation, you ask for a place to stay and Booking.com shows up as an interactive card, you sketch an idea and Canva opens inline.

The thing that makes this real for developers is the **Apps SDK** — and the most important detail is that it is **built on the Model Context Protocol (MCP)**. OpenAI did not invent a proprietary plugin format this time. It standardized on the same open protocol the rest of the industry is converging on, and added a UI layer on top.

The short answer: **ChatGPT is now a distribution platform, and the Apps SDK is how you ship to it.** If you build software, "being inside ChatGPT" is about to be a channel you have to think about — the way "being in the App Store" became one in 2008.

<StatHighlight
  title="THE REFORM AT A GLANCE"
  stats={[
    { value: '900M', label: 'Weekly users', sublabel: 'the new distribution surface' },
    { value: 'MCP', label: 'Built on', sublabel: 'open standard, not a plugin silo' },
    { value: '7+', label: 'Launch partners', sublabel: 'Spotify, Canva, Figma, Booking…' },
    { value: 'Inline', label: 'App UIs', sublabel: 'rendered in the conversation' }
  ]}
/>

<ReaderPaths
  title="WHO SHOULD READ WHAT"
  intro="This covers three audiences: people who just want to understand the shift, developers who want to build, and teams deciding whether to invest."
  columns={3}
  paths={[
    {
      eyebrow: 'EVERYONE',
      title: 'You want to understand the change',
      description: 'Read what the super app is and why MCP matters.',
      focus: ['The super app', 'Why MCP', 'Launch partners'],
      outcome: 'You will understand why this is bigger than "ChatGPT got plugins again."',
      tone: 'info'
    },
    {
      eyebrow: 'DEVELOPERS',
      title: 'You want to build an app',
      description: 'Jump to how apps work and the build walkthrough.',
      focus: ['Architecture', 'Build steps', 'Submission + Directory'],
      outcome: 'You will know exactly what an Apps SDK app is made of and how to ship one.',
      tone: 'success'
    },
    {
      eyebrow: 'PRODUCT + STRATEGY',
      title: 'You are deciding whether to invest',
      description: 'Focus on the opportunity, the risks, and the checklist.',
      focus: ['Distribution upside', 'The risks', 'Readiness checklist'],
      outcome: 'You will leave with a clear-eyed view of the upside and the platform-dependency risk.',
      tone: 'warning'
    }
  ]}
/>

## TL;DR

- OpenAI reworked ChatGPT into a **super app**: agents, Codex, image generation, and **third-party apps** live inside the main interface, reaching ~900M weekly users.
- The **Apps SDK** is how developers build those apps, and it is **built on MCP (Model Context Protocol)** — an open standard, not a closed plugin format.
- An app is an **MCP server** that lists tools, executes tool calls, and returns **widgets** — web UI components ChatGPT renders **inline** in the conversation via a sandboxed iframe.
- The UI talks to ChatGPT over a **JSON-RPC bridge (postMessage)** and can request **inline, picture-in-picture, or fullscreen** display via `window.openai.requestDisplayMode`.
- **Launch partners** included Booking.com, Canva, Coursera, Figma, Expedia, Spotify, and Zillow.
- Apps are available to logged-in users **outside the EEA, Switzerland, and the UK** on **Free, Go, Plus, and Pro**.
- Developers submit apps through a **submission portal**; approved ones land in the **App Directory** to be discovered and shared.
- Because it is MCP-based, the **same app can run in other MCP Apps-compatible hosts** — you build the UI once.

![ChatGPT super app anatomy showing agents, Codex, image generation, and third-party apps embedded in one interface](/blog/chatgpt-super-app-anatomy.svg)

## What the "Super App" Reform Actually Is

For years, ChatGPT was a text box with a model behind it. The reform changes the **shape of the product**: the conversation becomes a surface where different capabilities and apps render directly.

Concretely, the redesigned ChatGPT pulls several things into one place:

- **Agents** that can take multi-step actions on your behalf
- **Codex**, the coding tool, available in-line for engineering work
- **Image generation** as a first-class capability, not a mode you switch to
- **Third-party apps** — Spotify, Canva, Figma, Booking.com and more — that render interactive UI inside the chat

Codex and Figma sitting side by side in that same launch lineup is not a coincidence — see [how to turn Figma designs into production React with Codex](/blog/figma-codex-react-2026) for that workflow in practice.

The strategic move is obvious once you name it: OpenAI wants ChatGPT to be the place you **start** a task, not the place you go to get text you then paste elsewhere. That is the definition of a super app — one interface that handles many jobs — and it is the same playbook WeChat ran in China a decade ago.

<Callout title="Why this is not 'plugins, again'" tone="info">
The 2023 plugin era failed partly because it was a closed, bespoke format with weak UI and weak discovery. The 2026 reform fixes all three: it is built on the **open MCP standard**, apps render **rich inline UI**, and there is a real **App Directory** for discovery. Same ambition, much better foundation.
</Callout>

## Why Building on MCP Is the Real Story

The single most important technical decision in this release is that the **Apps SDK builds on the Model Context Protocol.**

MCP is the open standard for connecting models to external tools and data. If you have already built an MCP server — for Claude, for an internal agent, for anything — you are most of the way to a ChatGPT app. And because ChatGPT implements the same **iframe-and-bridge model** that the broader **MCP Apps** effort defines, a UI you build for ChatGPT can run in other MCP Apps-compatible hosts too.

That is a genuinely different bet than a proprietary plugin store. It means:

- **You build once.** The tool contract and UI bridge are standardized.
- **You are not fully locked in.** MCP is an open protocol with multiple hosts.
- **The ecosystem compounds.** Every MCP investment across the industry now points at ChatGPT distribution too.

If you are new to MCP, start with my [guide to building an MCP server](/blog/how-to-build-mcp-server) and the walkthrough on [deploying an MCP server on Cloudflare Workers](/blog/deploy-mcp-server-cloudflare-workers) — the same server you build there is the foundation for a ChatGPT app.

## How the ChatGPT Apps SDK Works

An app in ChatGPT has two halves: an **MCP server** (the logic) and an optional **UI component** (the interface). This is the core of the ChatGPT Apps SDK — here is the anatomy.

![ChatGPT Apps SDK architecture: an MCP server exposes tools and widgets, and ChatGPT renders the UI in a sandboxed iframe connected by a JSON-RPC bridge](/blog/chatgpt-apps-sdk-architecture.svg)

At minimum, your MCP server implements three capabilities:

<ProcessSteps
  title="THE THREE MCP CAPABILITIES"
  intro="A minimal Apps SDK integration is just these three things. Everything else is polish."
  steps={[
    {
      eyebrow: 'CAPABILITY 1',
      title: 'List tools',
      description: 'Your server advertises the tools it supports, each with a JSON Schema input/output contract and optional annotations.',
      bullets: [
        'This is how the model knows what your app can do',
        'Clear names and schemas make the model call tools correctly',
        'Annotations hint at behavior (read-only, destructive, etc.)'
      ],
      tone: 'info'
    },
    {
      eyebrow: 'CAPABILITY 2',
      title: 'Call tools',
      description: 'When the model selects a tool, it issues a call with arguments that match the user’s intent. Your server executes the action and returns structured content.',
      bullets: [
        'You enforce auth and validate inputs here',
        'Return structured content the model can parse',
        'This is where your real business logic runs'
      ],
      tone: 'success'
    },
    {
      eyebrow: 'CAPABILITY 3',
      title: 'Return widgets',
      description: 'Alongside structured content, return embedded resources in the response metadata so the Apps SDK can render your interface inline in ChatGPT.',
      bullets: [
        'The widget is a web UI bundle pointed to by the tool',
        'ChatGPT renders it in a sandboxed iframe',
        'The UI and model stay in sync through the bridge'
      ],
      tone: 'violet'
    }
  ]}
/>

The UI half runs inside a **sandboxed iframe** and communicates with ChatGPT over a standard bridge — **`ui/*` JSON-RPC messages over `postMessage`**. Your component can read state, call your tools, and negotiate how it is displayed:

```js
// Inside your app's UI bundle, running in the ChatGPT iframe.

// Ask ChatGPT to present the widget larger for an interactive task.
await window.openai.requestDisplayMode({ mode: 'fullscreen' }); // or 'inline' | 'pip'

// Call one of your MCP server's tools from the UI and render the result.
const result = await window.openai.callTool('search_listings', {
  location: 'Lisbon',
  checkIn: '2026-08-01'
});
renderListings(result.structuredContent);
```

<Callout title="The bridge is the whole trick" tone="success">
Your UI never talks to the network directly for app logic — it talks to ChatGPT over the bridge, and ChatGPT relays to your MCP server. That is what keeps apps sandboxed, consistent, and portable across MCP Apps hosts. Build the UI once; the host handles presentation.
</Callout>

### The display modes

`window.openai.requestDisplayMode` lets a widget negotiate how it appears:

<ComparisonTable
  headers={['Mode', 'What it is', 'Good for']}
  rows={[
    {
      label: 'inline',
      cells: [
        { text: 'Rendered directly in the conversation flow', tone: 'positive' },
        { text: 'Cards, results, quick previews', tone: 'neutral' }
      ]
    },
    {
      label: 'pip',
      cells: [
        { text: 'Picture-in-picture, floating over the chat', tone: 'positive' },
        { text: 'Media, live status, persistent widgets', tone: 'neutral' }
      ]
    },
    {
      label: 'fullscreen',
      cells: [
        { text: 'Takes over the surface for a focused task', tone: 'positive' },
        { text: 'Editors, maps, multi-step flows', tone: 'neutral' }
      ]
    }
  ]}
/>

## Building an App: The Shape of the Work

You do not need to learn a new framework. If you can write an MCP server and a small web UI, you can build a ChatGPT app.

<ProcessSteps
  title="FROM ZERO TO SUBMITTED"
  intro="The end-to-end path for shipping an app into ChatGPT."
  steps={[
    {
      eyebrow: 'STEP 1',
      title: 'Build the MCP server',
      description: 'Define your tools with JSON Schema, implement the call handlers, and enforce auth. This is standard MCP work.',
      bullets: [
        'Start from an existing MCP server if you have one',
        'Keep tool schemas tight so the model calls them correctly'
      ],
      tone: 'info'
    },
    {
      eyebrow: 'STEP 2',
      title: 'Build the UI bundle',
      description: 'Write a web component that renders your tool results and talks to ChatGPT over the window.openai bridge.',
      bullets: [
        'Use requestDisplayMode to pick inline / pip / fullscreen',
        'Handle the sandboxed iframe constraints (no assumptions about the host)'
      ],
      tone: 'success'
    },
    {
      eyebrow: 'STEP 3',
      title: 'Point tools at widgets',
      description: 'Return your UI bundle as an embedded resource in tool response metadata so ChatGPT knows what to render.',
      bullets: [
        'Each tool can map to its own widget',
        'Return structured content the model can also reason over'
      ],
      tone: 'violet'
    },
    {
      eyebrow: 'STEP 4',
      title: 'Submit and get listed',
      description: 'Submit through the app submission portal. Apps that meet quality and safety standards land in the App Directory.',
      bullets: [
        'Discovery and sharing happen through the Directory',
        'Meet the review bar before you count on distribution'
      ],
      tone: 'warning'
    }
  ]}
/>

<Callout title="Availability caveat" tone="warning">
At launch, apps in ChatGPT were available to logged-in users **outside the EEA, Switzerland, and the UK**, on Free, Go, Plus, and Pro. If your audience is primarily European, factor that rollout gap into any launch plan — the distribution surface is not yet global.
</Callout>

## The Opportunity — and the Risk

This is a real distribution channel, but building on someone else's platform always cuts both ways.

<ProsCons
  title="SHOULD YOU BUILD FOR CHATGPT?"
  intro="The upside is enormous reach. The downside is the oldest one in platform history: dependency."
  pros={[
    'Access to ~900M weekly users without acquiring them yourself',
    'Built on open MCP — reuse existing servers and run in other hosts',
    'Rich inline UI, not a flat text plugin — real product experiences',
    'A real App Directory for discovery, unlike the 2023 plugin era',
    'Distribution where users already start their tasks'
  ]}
  cons={[
    'Platform dependency: OpenAI controls discovery, ranking, and the rules',
    'Regional gaps at launch (no EEA, Switzerland, or UK)',
    'A review/quality bar you must clear and keep clearing',
    'Your UX lives inside someone else’s surface and constraints',
    'Monetization and data terms are the platform’s to change'
  ]}
  verdict="Build for it as a channel, not as your foundation. Reusing MCP work keeps the cost low and the lock-in lower."
/>

For brands, the mental shift is the same one search and app stores forced: **users increasingly start inside an aggregator.** If people begin their travel, design, or media tasks in ChatGPT, being absent from the App Directory is a discovery problem — the same way being absent from Google once was.

## Readiness Checklist

<Checklist
  title="Before you ship a ChatGPT app"
  items={[
    { text: 'Decide the channel strategy: is ChatGPT a new surface for an existing product, or a standalone bet? Do not make it your only foundation.', priority: 'critical' },
    { text: 'Reuse or build an MCP server with tight, well-documented tool schemas so the model calls tools reliably.', priority: 'critical' },
    { text: 'Design the UI for a sandboxed iframe and choose display modes deliberately (inline vs pip vs fullscreen).', priority: 'high' },
    { text: 'Enforce auth and validation server-side — never trust the client UI for anything sensitive.', priority: 'critical' },
    { text: 'Plan for the regional availability gap (no EEA / Switzerland / UK at launch).', priority: 'medium' },
    { text: 'Read the submission guidelines and design to clear the quality and safety review, not just to demo.', priority: 'high' }
  ]}
/>

## The Bigger Picture: This Pairs With GPT-5.6

The super app reform did not ship in a vacuum. It arrived in the same window as the [GPT-5.6 model family](/blog/openai-gpt-5-6-sol-terra-luna-guide), and the two reinforce each other. A more capable, more efficient model makes agentic, multi-app workflows economically viable; a super app surface gives that model somewhere to *do* things. Cheaper tokens plus a distribution platform is how "AI agent that gets real work done" stops being a demo.

If you are building agents that call many tools, the same discipline I wrote about in [the agentic AI enterprise security model](/blog/agentic-ai-enterprise-security-model) applies: capability without governance is a liability, and apps inside ChatGPT are no exception.

## FAQ

<FAQAccordion
  intro="The questions developers and product teams ask first about apps in ChatGPT."
  items={[
    {
      question: 'Is the Apps SDK just plugins with a new name?',
      answer: "No. The key difference is that it is built on the open MCP standard, apps render rich inline UI in a sandboxed iframe, and there is a real App Directory for discovery. The 2023 plugin format had none of those. It is a much stronger foundation for real products.",
      tag: 'Basics'
    },
    {
      question: 'Do I need to learn a proprietary framework?',
      answer: "No. An app is an MCP server plus a web UI bundle. If you can build an MCP server and a small front-end that talks over the window.openai bridge, you can build a ChatGPT app. Existing MCP servers are reusable.",
      tag: 'Building'
    },
    {
      question: 'Can my ChatGPT app run anywhere else?',
      answer: "Yes, in principle. ChatGPT implements the same iframe-and-bridge model as the broader MCP Apps effort, so a UI you build to this contract can run in other MCP Apps-compatible hosts. That reduces lock-in compared with a proprietary plugin store.",
      tag: 'Portability'
    },
    {
      question: 'How do users find my app?',
      answer: "Through the ChatGPT App Directory, and through the model surfacing your app when it is relevant to a user's request. Apps that meet OpenAI's quality and safety standards can be listed, made discoverable, and shared.",
      tag: 'Discovery'
    },
    {
      question: 'Where is it available?',
      answer: "At launch, apps in ChatGPT were available to logged-in users outside the EEA, Switzerland, and the UK, on Free, Go, Plus, and Pro plans. European availability was expected to follow later.",
      tag: 'Availability'
    },
    {
      question: 'What are the risks of building on it?',
      answer: "Platform dependency. OpenAI controls discovery, ranking, review, and the commercial terms, and can change them. Build for ChatGPT as a distribution channel that reuses your MCP work — not as the sole foundation of your product.",
      tag: 'Risk'
    }
  ]}
/>

## Final Take

The ChatGPT super app reform is OpenAI's clearest bet yet that the **interface**, not just the model, is the product.

By building the Apps SDK on MCP, OpenAI turned "being inside ChatGPT" into a channel you can reach with mostly standard, reusable work — and turned ChatGPT into a distribution platform sitting in front of ~900 million weekly users. That is a genuine opportunity and a genuine dependency at the same time.

The right posture is pragmatic: **reuse your MCP investment, ship an app as a channel, design for portability, and keep your product's center of gravity your own.** Do that, and the super app is upside without the classic platform trap.

Next, read the [GPT-5.6 complete guide](/blog/openai-gpt-5-6-sol-terra-luna-guide) that shipped alongside it, and — if you are building the backend — my [MCP server guide](/blog/how-to-build-mcp-server).

## Sources

- [OpenAI: Introducing apps in ChatGPT and the new Apps SDK](https://openai.com/index/introducing-apps-in-chatgpt/)
- [OpenAI Developers: Apps SDK](https://developers.openai.com/apps-sdk)
- [OpenAI Developers: Build your ChatGPT UI](https://developers.openai.com/apps-sdk/build/chatgpt-ui)
- [OpenAI: Developers can now submit apps to ChatGPT](https://openai.com/index/developers-can-now-submit-apps-to-chatgpt/)
- [Model Context Protocol Blog: MCP Apps — bringing UI capabilities to MCP clients](https://blog.modelcontextprotocol.io/posts/2026-01-26-mcp-apps/)

**Explore more:** [AI Coding Agents & Developer Experience](/topics/ai-coding-agents)

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