Apparently the score would be a little higher if it weren't for the fact that scores are penalized for being worse than the human baseline, but aren't rewarded for being better than the human baseline (which seems like an arbitrary decision. The human baseline is not optimal).
Once you have matched humans on a problem then further progress on that problem is not necessarily meaningful anymore, in terms of quantitative measurement of intelligence. ARC-AGI-3 is designed to compare AIs to humans, not to measure arbitrarily high levels of superhuman intelligence. For that you would want a different benchmark.
