GPT-6 Sol from @OpenAI on ARC-AGI (Verified): - ARC-AGI-3: 4.6%, $5.6K (standard harness), 23.0%, $8.7K (provider adapter harness) - ARC-AGI-2: 89.6%, $0.44/task - ARC-AGI-1: 95.5%, $0.14/task Sol reaches 23.0% on ARC-AGI-3, vs Luna's 0.59% and Astra's 99.9%.