Your AI Benchmark Might Be Measuring the Harness, Not the Model

I nearly turned four software bugs into four model personalities

This article was edited with AI assistance. The cases and data come from real batch runs in the Kai! AI Arena. Every claim is limited to the game rules, model versions, and experimental setup used at the time. This is not a general model ranking.

If I had published one day earlier, DeepSeek V4-Pro might have acquired a personality trait it never had: bidding without looking at its dice.

First, a quick explanation of the table. In Liar's Dice, each player has a set of hidden dice. Players take turns claiming that the whole table contains at least N dice of a particular face. The next player must either raise the bid or challenge it. Everyone then reveals their dice: if the bid holds, the bidder wins; if it does not, the challenger wins. In Kai!, looking at your...

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