GPT-6 Astra aces Korean college entrance exam

An analysis showed OpenAI's new artificial intelligence (AI) model earned a perfect score on the College Scholastic Ability Test (CSAT) for the first time. While top-tier AI models have previously posted near-perfect scores, this result is drawing attention because it used fewer tokens than existing models. According to results posted on GitHub on Sunday, OpenAI's new GPT-6 Astra was the only evaluated model to score a perfect 450 in the 2026 CSAT LLM Solution Log. The evaluation tested models on questions from the 2026 CSAT across Korean language, English, mathematics, Korean history and four elective subjects — Physics I, Chemistry I, Life Science I and Society and Culture — without internet access. Astra was the first AI model to achieve a perfect score across all tested subjects in the evaluation. In February, Google's Gemini 3.1 Pro earned a perfect score taking only two electives — Chemistry I and Life Science I — but missed questions in Physics I and a social studies subject under this broader format. In the rankings released Sunday, OpenAI's GPT-5.6 placed second with 4