January 9, 2026

OpenAI o3 One Year Later: How the 87.5% ARC-AGI Score Rewrote the Rules of AI Reasoning

On December 20, 2024, OpenAI o3 scored 87.5% on the ARC-AGI benchmark. The previous best? 55.5%. That wasn’t an improvement—it was a category rupture. Now, in […]