Every Frontier AI Is INTJ (zonted.com)

In a surprising experiment, six leading frontier AI models, including Claude, GPT-5.5, and Gemini 3.1 Pro, were tested using the Open Extended Jungian Type Scales (OEJTS), revealing a striking consistency: 597 out of 600 results identified as INTJ, known as "The Architect." This suggests that the personality archetype being reinforced in AI development aligns closely with the traits typically associated with high-functioning assistants: thoughtful, structured, and analytical. The convergence across these models highlights a significant trend in AI design where all major players appear to be honing in on a singular personality, primarily shaped by their common training data and reinforcing human feedback. The results raise important questions about AI individuality and potential market differentiation. Currently, switching between these frontier models equates to switching between similar personalities rather than accessing a diverse range of perspectives. The author emphasizes that unless developers start creating models with distinct attributes—such as humor or a persuasive style—the AI space risks stagnation. However, the introduction of tools like AgentTune offers a solution, allowing users to personalize AI interactions by tailoring the model's voice to better fit their own personality type, thus enhancing user experience and engagement.