Anthropic released Claude Opus 5 on July 24; ARC Prize verified 30.16% on ARC-AGI-3. Previous best published result 7.78%. Caveats: ARC Prize tested Opus 5 only at high effort, not max; 7.78% comparison was at max effort — lead is real but not effort-matched. ARC-AGI-3 drops models into unfamiliar interactive environments with no natural-language instructions.