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FergusArgyllyesterday at 7:48 PM1 replyview on HN

They hide the CoT because they don't want competitors to train on it


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orbital-decayyesterday at 8:04 PM

Training on the CoT itself is pretty dubious since it's reward hacked to some degree (as evident from e.g. GLM-4.7 which tried pulling that with 3.0 Pro, and ended up repeating Model Armor injections without really understanding/following them). In any case they aren't trying to hide it particularly hard.

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