OpenResponses
GPT-5.X - Responses API
Free · Designed for iPad. Not verified for macOS.
GPT-5.4, Apple Calendar/Contacts/Reminders, camera and file attachments, Code Interpreter, computer use, and full Request Inspector.
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AI output can be inaccurate or outdated.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
Ratings & Reviews
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
The developer, Gunnar Hostetler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Gunnar Hostetler
- Size
- 7.2 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Spanish
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 Gunnar Hostetler