They finally killed model access to Opus, GPT 5.4, and Gemini 3.1 Pro.
You can still access the likely last ever version version here, but note that you are only limited to shit models, so if you want Opus or even Gemini Pro, look elsewhere:
Arena API Bridge Tampermonkey Script
Maybe I'll come back to developing this script if Opus, Gemini 3.1, and GPT 5.4 actually do come back, but I no longer care about the "hobby" and moved on a long time ago apart from occassional RP and lurking. Here are some alternative LMArena scripts if you intend on suffering more:
https://github.com/cloudWaddie/LMArenaBridge/
https://github.com/jtostrings/LMarenaBridge/
I recommend using another source apart from Arena.ai or better yet, touching grass and abandoning that dead general. Find a better hobby!
