GPT-6 Astra Finished Portal Unassisted in 23h43m, and Its 99% ARC-AGI-3 Score Was Harness-Dependent
ARC Prize·high signal
Quesma reports Astra completed the 3D game Portal end to end with no human help in 23 hours 43 minutes for roughly $570 in tokens, and solved 80 of 154 Baba Is You levels, beating Fable 5.1's 33. On ARC-AGI-3 the model scored about 99% under a custom reasoning-state harness but 62.7% on ARC Prize's own provider-neutral setup, against a 48% human average. The gap is the story for builders: the harness, not the weights, produced a third of the headline number.