For example: Of the initial users of the Claude 4 Sonnet and Gemini 2.5 Pro, 40% remained active after 5 months. The "early adopters" of the GPT-4o Mini became a fixed base; DeepSeek is experiencing a "reflow effect": users try other models and then return to it.
OpenAI may have discovered this phenomenon quite early on. So they have been working on GPT's personality and enhancing its memory capabilities to create a deep emotional connection between GPT and users! In contrast, we might not be able to perceive the individuality of other models!