Users get two completions for their prompt and rank them. From this you can then use Bradley-Terry to get Elo scores per model.
300 karma · joined September 14, 2019
The article also suggests that the system used isn’t too far ahead of their upcoming general "DeepThink" model / feature, which is they announced for this summer.
Here is my Rust version with multi-threading, SIMD, WASM running on your device inside a WebApp: https://0xbe7a.github.io/mastermind/
Repo: https://github.com/0xbe7a/mastermind
It is quite fast (1.8 Billion position pairs evaluated in 1652ms on my device) and can also exploit some symmetries inside the solution space.