Cassiopeia
A simple mod that adds a chatbot to your Minecraft chat specifically for use to guide players in Hypixel Skyblock!
Screenshots
About this Mod
Cassiopeia – Multi-AI Chat Integration for Minecraft
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.
Features
- Multi-AI Support: Choose between Gemini 2.5 Flash, GPT-5, Grok, and Claude 3 Sonnet.
- Game State Integration: AI can see what item your holding and armour your wearing and more
- Local Storage: API keys, prompts, and history are stored locally — never shared with anyone except your selected AI provider.
- Conversation Memory: Remembers your last 5 exchanges for conversational consistency.
Usage
/ai
— Shows all available commands and usage info in-game.
/ai <prompt>
— Send a prompt to the currently configured AI model.
/ai api <model> <key>
— Save your API key for a model (Gemini, OpenAI, grok, Claude).
/ai model <name>
— Switch to a different AI model.
/ai clear
— Clear stored conversation history.
Get Your API Keys
- Gemini API Key (Google) (free with a Google account)
- OpenAI API Key (GPT-5)
- xAI API Key (Grok)
- Anthropic API Key (Claude 3)
Community
For support, suggestions, and early info on new updates, join our Discord server.
Available Versions
How to Install Cassiopeia on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Cassiopeia". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.8 (+3 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Cassiopeia server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Cassiopeia compatible with fabric?
Cassiopeia officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.8. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Cassiopeia – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Cassiopeia consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Cassiopeia with just one click on your server.