OpenAI AGI score hinges on harness

OpenAI's GPT-6 Astra scored 99.9% on ARC-AGI-3 only under its Provider Adapter harness; the standard harness yields 62.7%. ARC Prize published both results, stating it is not claiming AGI. The like-for-like comparison against GPT-5.6 Sol is 62.7% versus 7.8%.