I checked 30 frontier model cards. Here are the benchmarks labs report

Reporting over time Benchmark adoption frontier Three readings on one time axis. Each orange diamond marks an organization's first report of this benchmark, which is the only event that raises the cumulative count. The rug beneath it puts one tick per dated model card, so later cards from an organization already counted appear as gray ticks and leave the staircase flat. A card with no publication date cannot be placed on the timeline and is absent from both bands, though it is still counted in the totals above. A long flat run is reporting saturation observed within this curated registry, not a claim about benchmark score saturation. The score track below it is a separate reading: every value that could be read verbatim from a cited document, connected only where the instrument and protocol are identical. A flat score tail usually means no newer number could be read, which is why the gap is marked rather than drawn through. Frontier milestones