GPT-6 Sol’s reported ARC-AGI-3 score varies by harness: 4.6% or 23.0%

ARC Prize reports that GPT-6 Sol scored 4.6% on ARC-AGI-3 with the standard harness and 23.0% with a provider adapter harness. It also lists scores of 89.6% on ARC-AGI-2 at $0.44 per task and 95.5% on ARC-AGI-1 at $0.14 per task. Its post compares Sol’s 23.0% ARC-AGI-3 result with Luna’s 0.59% and Astra’s 99.9%.