Comment by throwa356262
3 days ago
"Opus 5 states the hidden rules before its first action, then plays a byte-identical optimal solution in 5/5 seeds at temperature 1.0. Zero exploration."
I guess there is no way this can happen without benchmark being part of the training data??
What seems to implied is that some of his hold out testing suite includes simple/common tests that are out in the wild, and for those opus went straight to a memorised solution .
Simple/common tests is not an explanation for why only now Opus 5 is the only model encoding the answers like this. Something like the holdout test suite being leaked or Anthropic cheating (e.g. 'accidentally' including previous hold out run data in Opus 5 training) makes a much stronger fit.
No, I believe you are misunderstanding the quote. Each “question” in ARC-AGI-3 is a game that has hidden rules that you can understand if you look at the game board long enough. This quote means that Opus 5 is looking at the game board, figuring out the rules, and writing out the rules before it makes a single move. You can do the same thing if you go to the ARC-AGI-3 website and try some of the games.
They state the puzzle is "Witness-like" which I assume means that it follows the rules from the well-known puzzle game "The Witness" which Opus definitely knows.
It may read information about the benchmark, such as on blog post, or Twitter feeds (example OP) without active cheat