Update Log

October 10, 2026 (charts)

Updated trend charts with denser approximate series based on public data points:

• ECI: anchored to known points (Claude 3.5 Sonnet ≈130, Opus 5.5 =167) and ~14 pts/year reasoning-era trend.
• METR: denser points including Opus 4.5 (~5.3h), Opus 4.6 (~12h), Mythos early (~17h 50% / ~3.1h 80%).

Charts remain approximate frontiers, not full extracted time series. Sources: Epoch AI, METR Time Horizon 1.1.

ECI updates

Placeholder entry. Future ECI data revisions will be recorded here with source and reason.

METR Time Horizon updates

Placeholder entry. Future METR measurement updates will be recorded here with source and reason.

Hard benchmark updates

Placeholder entry. Changes to selected hard benchmarks (inclusion or replacement) will be recorded here.