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S-tier comes from games. An A to F scale with S representing a "super" or "superior" rating has been around in that space quite a bit longer than LLMs.

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I always thought it came from the Japanese school rating system, where the concept was transferred to the west through the medium of games. I was under the impression that this system preceded the creation of video games but I can not find a reference for that.

In Japan the "S" is explained as shū (秀) "Exemplary, excellent".

https://en.wikipedia.org/wiki/Academic_grading_in_Japan

https://en.wikipedia.org/wiki/Academic_grading_in_the_United...

- it also comes from one punch man

- the greatest heroes are in the S-Tier

- A ranking heroes are the second best

- Then B, C, D, E, F....

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