OpenAI claims GPT-5.6 Sol beats Opus 5 on ARC-AGI-3 but only with its own custom test harness
OpenAI says it can keep up on ARC-AGI-3. After Anthropic’s Claude Opus 5 quadrupled the record score on the logic benchmark, OpenAI is now showing that GPT-5.6 Sol hits 38.3 percent with two API…