# OpenResponses — GPT-5.X - Responses API

> Native iPhone client for OpenAI API with advanced control and tool support. (iPhone/iPad app by Gunnar Hostetler.)

- Source: https://appshunter.io/ios/app/openresponses/id6757338355 (this page in markdown: same URL + `.md`)
- Developer: [Gunnar Hostetler](https://appshunter.io/developer/1768599987)
- Category: Developer Tools, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English, European Spanish
- Released: 2026-01-12
- Data updated: 2026-09-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/openresponses/id6757338355/reviews.md

## What is OpenResponses?

OpenResponses is a native iPhone client for the OpenAI Responses API built for people who want full control, clear observability, and modern tool support. Bring your own API key, stream responses in real time, inspect every request, and use the latest OpenAI models in a fast SwiftUI interface.

Model Lineup

- GPT-5.4, GPT-5.3, GPT-5.2, GPT-5.1, GPT-5, and GPT-5-mini
- o3 and o4-mini reasoning models with configurable effort
- GPT-4.1 family, GPT-4o, and gpt-image-1

What Makes It Different

- Real-time streaming with activity feed, token usage, and Assistant Thinking traces
- Request Inspector for payloads, tool calls, and raw Responses API details
- Explore Demo so new users can try the interface before adding an API key
- Prompt Library, advanced model controls, exports, and local conversation history
- Message quick actions plus direct camera, photo, file, and document attachments

Tools Included

- Web Search with live sources
- Code Interpreter for Python, analysis, charts, and artifacts
- Image Generation with gpt-image-1
- File Search and vector store workflows
- Computer Use preview with explicit approval steps
- Direct Notion integration and Apple system tools when you choose to enable them

Built for Apple

- Calendar, Contacts, and Reminders tools when you enable them
- Permissions shown only when related features are used
- SwiftUI experience with Dark Mode, Dynamic Type, and VoiceOver support

Privacy

- Your OpenAI API key is stored in the iOS Keychain
- Before the first live AI request, the app shows an in-app OpenAI data sharing notice and requires explicit approval
- No required account
- Conversation history stays on device unless you choose to send or export it

AI output can be inaccurate or outdated. Verify important information before acting.

Requirements

- iOS 17.0 or later
- Your own OpenAI API key with active billing

## Key features

- Real-time response streaming
- Request inspector for API details
- Prompt library and advanced model controls
- Web search and code interpreter tools
- Image generation capabilities
- Direct Notion and Apple system tool integration


## Frequently asked questions about OpenResponses

### What AI models does OpenResponses support?

OpenResponses supports a wide range of OpenAI models including GPT-5.4, GPT-5.3, GPT-5.2, GPT-5.1, GPT-5, GPT-5-mini, o3 and o4-mini reasoning models, GPT-4.1 family, GPT-4o, and gpt-image-1. The app requires users to provide their own OpenAI API key.

### Does OpenResponses have ads?

No, OpenResponses is ad-free. The app is free to download and use, with no advertisements present.

### How is my OpenAI API key stored in OpenResponses?

Your OpenAI API key is securely stored in the iOS Keychain. This ensures that your sensitive API credentials are protected and only accessible by the application.

### Can I try OpenResponses before adding my API key?

Yes, OpenResponses includes an 'Explore Demo' feature. This allows new users to try out the interface and its functionalities before they need to add their own OpenAI API key.

### What are the system requirements for OpenResponses?

OpenResponses requires iOS 17.0 or later to run. It is compatible with both iPhone and iPad devices.

### How does OpenResponses handle user data and privacy?

Conversation history stays on the device unless you choose to send or export it. The app also shows an in-app OpenAI data sharing notice and requires explicit approval before the first live AI request. No account is required.

### What kind of tools are integrated into OpenResponses?

OpenResponses integrates several tools including Web Search with live sources, a Code Interpreter for Python analysis, Image Generation, File Search, and Computer Use preview. It also offers direct Notion integration and Apple system tools like Calendar and Contacts when enabled.

### How often is OpenResponses updated?

The latest version of OpenResponses is 2.0, which was last updated on April 26, 2026. While specific update frequency isn't detailed, the app has seen regular updates to incorporate new models and features.

## Version history (last 3 releases)

### 2.5 — 2026-06-20

Version 2.5 brings a major under-the-hood overhaul to make the playground experience faster, safer, and more reliable.

Performance & Speed:
- Greatly improved rendering speeds for the File Manager, Vector Store uploads, and chat history
- Scrolling through files and conversations is now significantly smoother and more responsive

Reliability Fixes:
- Fixed an issue where the chat interface could occasionally lock up if a network error occurred while the AI was generating text
- Enhanced the URL detection engine to better recognize, extract, and render web pages directly within conversations

Privacy & Security:
- Strengthened privacy safeguards to ensure authorization tokens and private keys are aggressively redacted and never leaked during app diagnostics

New Models:
- Added full support for the new GPT-5.5 family of models, including GPT-5.5, Pro, Mini, and Nano

### 2.0 — 2026-04-26

OpenResponses 2.0 is a major update since the original App Store launch.

- Added GPT-5.4, GPT-5.3, GPT-5.2, GPT-5.1, GPT-5-mini, refreshed model aliases, and better model compatibility controls
- Added Apple Calendar, Contacts, and Reminders tools with safer permission flows and improved local-time handling
- Added Explore Demo, camera capture, better file and image attachments, message quick actions, and cleaner chat and settings UI
- Added Request Inspector, activity feed, reasoning traces, token usage, and more reliable streaming and tool-call follow-through
- Added an explicit first-send OpenAI data sharing notice with Allow & Send consent before live requests leave the device
- Strengthened App Store disclosures, privacy copy, and approval flows for computer use and other sensitive actions

### 1.0 — 2026-01-12

No release notes.

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## More apps by Gunnar Hostetler

- [OpenAssistant](https://appshunter.io/ios/app/openassistant/id6692613772)
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- [OpenIntelligence](https://appshunter.io/ios/app/openintelligence/id6756559175)

All apps by Gunnar Hostetler: https://appshunter.io/developer/1768599987

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*