ARC-AGI-3 Framework Differences Produce 37-Point Gap in GPT-6 Astra Scores
A test report released by ARC Prize on September 3, 2026, shows GPT-6 Astra posting a 37-point score gap on the ARC-AGI-3 Semi-Private task set—62.7% under the standard harness versus 99.9% under the Provider Adapter harness. The discrepancy stems from differing state retention rules between the two evaluation frameworks.