The Open AI Level Test (OpenALT) is an open-source English proficiency assessment designed to estimate learners’ levels using the Common European Framework of Reference for Languages (CEFR). The test integrates vocabulary knowledge, listening response, and short conversational interaction to provide a practical estimate of proficiency aligned with CEFR levels and Can-Do descriptors. It consists of three components. First, a vocabulary diagnostic measures receptive lexical knowledge using high-frequency items drawn from the New General Service List (NGSL). Second, a listening-response module evaluates learners’ ability to understand short spoken prompts and produce brief responses. Third, an AI-powered conversational task elicits short spoken or typed responses through a chatbot interface. By combining these components, the test offers an efficient and accessible way to assess communicative ability across CEFR levels.