Formerly known as LMArena Plus
Arena.ai Plus is a Chrome Extension that infuses the power of Arena.ai's human-vetted blind scoring with the context needed to make actual business decisions. It enriches the Arena.ai leaderboards with real-time pricing data, a "Bang for Buck" value metric, and deeper model insights - helping you save on API expenses by picking the smartest model at the right price.
See what every model actually costs, right inside the leaderboard. Arena.ai Plus injects a Pricing column with fresh data from your choice of provider:
- OpenRouter
- Helicone
- LiteLLM
Switch providers or toggle token units (1M / 100K) from the extension popup.
The core value metric - designed to surface the smartest models for the lowest price.
- Measures relative intelligence against cost using a logarithmic pricing curve.
- Applies a quality bonus to top-ranked models so elite-tier performance is weighted fairly.
- Helps you identify which models deliver the most intelligence per dollar.
- Model Age - See how many days since each model was released, so you can spot the newest contenders at a glance.
- Context Window - Instantly see the maximum token limit for every model.
- Modalities - Visual icons indicating support for Text, Image, Audio, or Video (both Input and Output).
Get browser notifications when a generation completes:
- Battle / Side-by-side mode - Both models finish and voting is ready.
- Direct chat - Your model finishes generating.
Perfect for long code generations where you've switched to another tab.
- Light & Dark Mode - All injected elements adapt automatically.
- Smart Tooltips - Detailed cost breakdowns (Input vs. Output) appear on hover.
- Column Picker - Toggle any column (native or Plus) on or off via the extension popup to keep your view clean and focused.
- Native Sorting - All injected columns are fully sortable, integrating with Arena.ai's table controls.
Install Arena.ai Plus from the Chrome Web Store
- Download or clone this repository to your local machine.
- Open Chrome and navigate to
chrome://extensions/. - Enable "Developer mode" in the top-right corner.
- Click "Load unpacked" and select the folder containing this project.
- Visit Arena and enjoy!
We believe that intelligence shouldn't always come at a premium. The algorithm calculates value by:
- Measuring Relative Intelligence - Subtracting a baseline from the Arena Score.
- Scaling Cost - Using a logarithmic curve so expensive models aren't unfairly penalized for minor price jumps.
- Weighting Quality - Applying a gentle decay to lower ranks, ensuring a rank #1 model is valued higher than a rank #50 model even when their price/score ratio is similar.
Feel free to open issues or submit pull requests if you have ideas for new features or data sources!
Distributed under the GPLv3 License. See LICENSE for more information.
Note: This extension is not affiliated with Arena.ai or Chatbot Arena. Pricing data is fetched from public APIs of the respective providers.
