METR data: Anthropic now pretrains every 45-60 days as capability gains double
zephyr_z9 · x · 2026-11-06
METR's AECI capability tracking shows Anthropic's benchmark scores growing at 1.9× their pre-October 2025 rate (95% CI 1.5×–2.8×), with the trend line jumping from +15/yr to +29/yr.
- Anthropic now completes a new pretrain every 45-60 days
- Data includes internal-only models: Model 2 (trained July 2026), Model 3 (Aug-Sep 2026), Model 4 (Sep-Oct 2026)
- Chart reveals internal codenames like Mythos plus future version points (Opus 4.7/4.8, Opus 5, Model 4)
- METR notes the acceleration estimate is sensitive to benchmark difficulty and trend methodology
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