The Sims 4 Gets AI: Sims Now Write Their Own Messages and Remember Conversations

A new AI mod for The Sims 4 lets Sims respond to messages on their own, take the other Sim’s mood and personality into account, and remember past conversations.

SimsGPT uses AI to make non-playable characters respond to messages based on their personalities, emotions, and relationships with other Sims. Players can talk to them in person or send messages using their controlled Sim’s phone.

The system takes into account traits, current mood, career, location, previous conversations, major life events, and even the in-game time of day. The mod also remembers message histories between specific characters, so relationships do not reset when players switch to another controlled Sim.

Conversations also affect friendship and romance levels. Each line can change them slightly in a positive, negative, or neutral direction, depending on the content of the conversation. The creator has also included restrictions: romantic interactions remain neutral when they involve underage Sims or close relatives.

SimsGPT includes additional features called Dynamic Narratives and GPT Paint, which can generate images and add them to the game, among other things. Installation requires XML Injector, a separate Windows application, and access to an AI service such as OpenAI, OpenRouter, or Ollama.

The mod is currently in alpha testing, so users should expect bugs and unfinished features. It is available to download on Nexus Mods.