Fable 5.1 was released 20 days ago. That's a lot of time to gather data. Since they're still tracking Opus 5 anyway, there is no obvious reason the perf delta section would be disabled. Are you involved with the project?
replyThe Anthropic post points to the latest fix on Sept 12, and the issues mentioned also only affected Sonnet 4 and Haiku. Opus was misbehaving just last week. You are choosing to not see the evidence of degration, 85% -> 75% is a generational dip in intelligence.
Not involved, no. Just guessing. It doesn't look frequently updated.
replyA lot of these daily-benchmarking sites popped up earlier this year. Most of them have faded away after they all failed to produce the smoking gun that everyone expected. This site survived because it kind of caught a dip one day, maybe.
The results are really rather flat and daily benchmark runs are expensive, so most of these projects give up after a while.