Oppenheimer is a cross-model comparison desktop tool that lets users interact with multiple AI assistants side-by-side. Designed to boost productivity and prompt testing, the app enables simultaneous input to tools like ChatGPT, Gemini, Bing, and Google Search�all from one clean interface. It�s built to run directly from your Mac menu bar and supports standalone windows for easy multitasking. With a Pro version offering unlimited panels and OTA updates, Oppenheimer is perfect for those who frequently explore or compare outputs from different large language models. Whether you�re writing, researching, coding, or just experimenting, Oppenheimer makes AI comparison seamless and fast.
Oppenheimer Review Summary Performance Score
A
Content/Output
Real-Time & Comparative
Interface
Lightweight & Multi-Panel
AI Technology
- AI Panel Comparison
- Real-Time Prompt Sync
- Menu Bar Access
- Cross-Model Testing
Purpose of Tool
Compare multiple AI model outputs side-by-side in real time
Compatibility
Desktop (macOS)
Pricing
Free plan + One-time Pro plan at $4.99
Who is Best for Using Oppenheimer?
- Developers: Test prompt variations across AI models quickly to refine logic and improve app integrations or chatbot quality.
- Writers and content creators: Compare tone and language across tools like ChatGPT and Gemini for better copy outcomes.
- Researchers: Use Oppenheimer to validate facts and perspectives from multiple LLMs without toggling between apps.
- Prompt engineers: Rapidly A/B test prompt structure, tone, and context across models in a single streamlined workflow.
Side-by-Side AI Comparison
Menu Bar Access
Unlimited Panels (Pro)
Over-the-Air Feature Drops
Real-Time Multi-Model Sync
Supports ChatGPT, Gemini, Bing, Google
LLaMa Support Coming Soon
No Login Required
Lightweight & Fast UI
Is Oppenheimer Free?
Yes, Oppenheimer offers a completely free version with core functionality, and a lifetime Pro license for a one-time payment of $4.99.
Oppenheimer Pricing Plans
- Basic Plan � Free: Access from menu bar, One standalone AI window, No OTA updates or bug fixes, Supports ChatGPT, Gemini, Bing, Google.
- Pro Plan � $4.99 (One-Time Purchase): Access from menu bar, Unlimited standalone windows, Over-the-air updates and bug fixes, ChatGPT, Gemini, Bing, Google side-by-side, LLaMa support (Claude coming soon), Lifetime license.
Oppenheimer Pros & Cons
Side-by-side AI comparison
Real-time prompt syncing
Lightweight, easy-to-use UI
No login required for access
Unlimited panels in Pro version
Free plan has limited functionality
Requires macOS for use
No mobile or web version
