Cassiopeia
by block_nate
Cassiopeia is a client-side Fabric chat mod that lets players send prompts to an AI model from inside the Minecraft chat, with several providers to choose from.
What it does
A player types a prompt in the chat and receives a real-time answer from the AI model they picked, without leaving the game. The mod works as a simple chatbot that can guide players through topics such as Hypixel Skyblock. Its chat commands list the available options and show usage details in-game, and players can clear the stored conversation history whenever they want.
Cassiopeia connects to several AI providers, each with its own API key that the player saves in the mod, and switching between models is a single command. The AI can also see the item the player is holding and the armour being worn, so answers can refer to the current gear. The mod works with Game State Integration, and Fabric API is required.
API keys, prompts and conversation history are kept in local storage and are not shared with anyone except the provider the player selects. Conversation memory keeps the last five exchanges, which keeps replies consistent from one message to the next. Only the player's game needs it, and servers run without it. The code is all rights reserved, so it is not open source. Files target game versions 1.21.5 – 1.21.11, with 1.1.15 for 1.21.11 as the latest Fabric file, published on 2026-06-06 on the beta channel.
Key features
Multi-provider AI chat
Gemini, OpenAI, xAI and Anthropic models can be chosen and switched from the chat, each with its own saved API key.
Game context for answers
The AI can see the held item and worn armour, so responses can relate to the player's current equipment.
Conversation memory
The last five exchanges are kept so that follow-up questions stay consistent with what was said before.
Local key and history storage
API keys, prompts and history stay on the player's machine and are sent only to the chosen provider.
In-game command help
Commands and usage details are shown in the game, and the stored conversation history can be cleared at any time.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Gemini in Minecraft is client-side only, open source under the MIT License, and built for 1.21 – 1.21.8. AskGemini is client-side only, open source under the GNU General Public License v3.0 only, and targets 1.21.11. Wikki Ai assitant is client-side only, open source under the MIT License, and targets 1.21.10. Cassiopeia is client-side only and is not open source; it is released under All rights reserved, with files for 1.21.5 – 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Cassiopeia | Fabric | 1.21.5 – 1.21.11 | Client-side only | 2026-06-06 |
| Gemini in Minecraft | Fabric | 1.21 – 1.21.8 | Client-side only | 2025-08-05 |
| AskGemini | Fabric | 1.21.11 | Client-side only | 2026-02-03 |
| Wikki Ai assitant | Fabric | 1.21.10 | Client-side only | 2025-11-30 |
Questions
Does Cassiopeia need Fabric API?
Does a server need Cassiopeia to be installed?
Which AI providers can be used?
In the catalog
Cassiopeia is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Cassiopeia is a client-side Fabric mod that integrates multiple AI models into the Minecraft chat system. Players can send prompts to their chosen AI directly in-game and receive real-time responses. — Shows all available commands and usage info in-game.
Official listing
- Modrinth page
- modrinth.com/mod/cassiopeia
- Owner
- block_nate
- Published
- 2025-07-21
- Updated on Modrinth
- 2026-06-06
- Facts verified
- 2026-10-15