SimsGPT mod adds AI-generated NPC replies to The Sims 4

The Sims 4 mod SimsGPT is now available and allows NPCs to send AI-generated replies in character. Players can chat with Sims in person or via the active Sim's phone. These replies use game details like personality traits, mood, career, location, and previous conversations to shape responses. The mod also saves conversation histories for Sim pairs so they can be reused if a player switches controlled characters.

The Sims 4 · official art via IGDB

Friendship and romance levels shift in a positive, negative, or neutral way after each conversation. Romance stays neutral if the Sims are closely related or underage. SimsGPT includes optional features called Dynamic Narratives and GPT Paint, which can generate paintings with AI and allow players to import images.

The mod is in alpha, so bugs or features that do not work as intended may occur. To use SimsGPT, you need XML Injector, an AI provider like OpenAI, OpenRouter, or Ollama, and a separate Windows desktop app. The author does not allow the mod to be reuploaded to other sites. Files marked as quarantined on Nexus Mods are undergoing automated safety reviews.