At max reasoning with the standard harness, 28 of 55 semi-private games reached the 12-hour runtime limit, capping how far testing could progress. Max scored 65.7% on ARC-AGI-3 versus 81.2% at xhigh; without the limit, we expect max would have scored higher.
Also note that the released Fable 5.2 uses different tuning at medium and xhigh reasoning effort than the earlier checkpoint we evaluated. Low, high, and max are unchanged.