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LLM for Unity enables seamless integration of Large Language Models (LLMs) within the Unity engine.
It allows to create intelligent characters that your players can interact with for an immersive experience.
LLM for Unity is built on top of the awesome llama.cpp and llamafile libraries.

• 💻 Cross-platform! Windows, Linux, macOS and Android
• 🏠 Runs locally without internet access. No data ever leaves the game!
• ⚡ Blazing fast inference on CPU and GPU (Nvidia, AMD, Apple Metal)
• 🤗 Supports all major LLM models
• 🔧 Easy to setup, call with a single line of code
• 💰 Free to use for both personal and commercial purposes

🧪 Tested on Unity: 2021 LTS, 2022 LTS, 2023
🚦 Upcoming Releases

• ⭐ Star the repo, leave us a review and spread the word about the project!
• Join us at Discord and say hi!
• Contribute by submitting feature requests or bugs as issues or even submiting a PR and become a collaborator!

• Verbal Verdict
• I, Chatbot: AISYLUM
• Nameless Souls of the Void
• Murder in Aisle 4
• Finicky Food Delivery AI
• AI Emotional Girlfriend

Method 1: Install using the asset store

• Open the LLM for Unity asset page and click Add to My Assets
• Open the Package Manager in Unity: Window > Package Manager
• Select the Packages: My Assets option from the drop-down
• Select the LLM for Unity package, click Download and then Import

Method 2: Install using the GitHub repo:

• Open the Package Manager in Unity: Window > Package Manager
• Click the + button and select Add package from git URL
• Use the repository URL https://github.com/undreamai/LLMUnity.git and click Add

First you will setup the LLM for your game 🏎:

• Create an empty GameObject.
  In the GameObject Inspector click Add Component and select the LLM script.
• Download one of the default models with the Download Model button (~GBs).
  Or load your own .gguf model with the Load model button (see LLM model management).

Then you can setup each of your characters as follows 🙋‍♀️:

• Create an empty GameObject for the character.
  In the GameObject Inspector click Add Component and select the LLMCharacter script.
• Define the role of your AI in the Prompt. You can define the name of the AI (AI Name) and the player (Player Name).
• (Optional) Select the LLM constructed above in the LLM field if you have more than one LLM GameObjects.

You can also adjust the LLM and character settings according to your preference (see Options).

In your script you can then use it as follows 🦄:

using LLMUnity;

public class MyScript {
  public LLMCharacter llmCharacter;
  
  void HandleReply(string reply){
    // do something with the reply from the model
    Debug.Log(reply);
  }
  
  void Game(){
    // your game function
    ...
    string message = "Hello bot!";
    _ = llmCharacter.Chat(message, HandleReply);
    ...
  }
}

You can also specify a function to call when the model reply has been completed.
This is useful if the Stream option is enabled for continuous output from the model (default behaviour):

  void ReplyCompleted(){
    // do something when the reply from the model is complete
    Debug.Log("The AI replied");
  }
  
  void Game(){
    // your game function
    ...
    string message = "Hello bot!";
    _ = llmCharacter.Chat(message, HandleReply, ReplyCompleted);
    ...
  }

To stop the chat without waiting for its completion you can use:

    llmCharacter.CancelRequests();

• Finally, in the Inspector of the GameObject of your script, select the LLMCharacter GameObject created above as the llmCharacter property.

That's all ✨!

You can also:

Build a mobile app on Android

To build an Android app you need to specify the IL2CPP scripting backend and the ARM64 as the target architecture in the player settings.
These settings can be accessed from the Edit > Project Settings menu within the Player > Other Settings section.

It is also a good idea to enable the Download on Build option in the LLM GameObject to download the model on launch in order to keep the app size small.

    llmCharacter.Save("filename");

    llmCharacter.Load("filename");

  void WarmupCompleted(){
    // do something when the warmup is complete
    Debug.Log("The AI is nice and ready");
  }

  void Game(){
    // your game function
    ...
    _ = llmCharacter.Warmup(WarmupCompleted);
    ...
  }

  void Game(){
    // your game function
    ...
    string message = "Hello bot!";
    _ = llmCharacter.Chat(message, HandleReply, ReplyCompleted, false);
    ...
  }

  void Game(){
    // your game function
    ...
    string message = "The cat is away";
    _ = llmCharacter.Complete(message, HandleReply, ReplyCompleted);
    ...
  }

  async void Game(){
    // your game function
    ...
    string message = "Hello bot!";
    string reply = await llmCharacter.Chat(message, HandleReply, ReplyCompleted);
    Debug.Log(reply);
    ...
  }

using UnityEngine;
using LLMUnity;

public class MyScript : MonoBehaviour
{
    LLM llm;
    LLMCharacter llmCharacter;

    async void Start()
    {
        // disable gameObject so that theAwake is not called immediately
        gameObject.SetActive(false);

        // Add an LLM object
        llm = gameObject.AddComponent<LLM>();
        // set the model using the filename of the model.
        // The model needs to be added to the LLM model manager (see LLM model management) by loading or downloading it.
        // Otherwise the model file can be copied directly inside the StreamingAssets folder.
        llm.SetModel("Phi-3-mini-4k-instruct-q4.gguf");
        // optional: you can also set a lora in a similar fashion
        llm.SetLora("my-lora.bin");
        // optional: you can set the chat template of the model if it is not correctly identified
        // You can find a list of chat templates in the ChatTemplate.templates.Keys
        llm.SetTemplate("phi-3");
        // optional: set number of threads
        llm.numThreads = -1;
        // optional: enable GPU by setting the number of model layers to offload to it
        llm.numGPULayers = 10;

        // Add an LLMCharacter object
        llmCharacter = gameObject.AddComponent<LLMCharacter>();
        // set the LLM object that handles the model
        llmCharacter.llm = llm;
        // set the character prompt
        llmCharacter.SetPrompt("A chat between a curious human and an artificial intelligence assistant.");
        // set the AI and player name
        llmCharacter.AIName = "AI";
        llmCharacter.playerName = "Human";
        // optional: set streaming to false to get the complete result in one go
        // llmCharacter.stream = true;
        // optional: set a save path
        // llmCharacter.save = "AICharacter1";
        // optional: enable the save cache to avoid recomputation when loading a save file (requires ~100 MB)
        // llmCharacter.saveCache = true;
        // optional: set a grammar
        // await llmCharacter.SetGrammar("json.gbnf");

        // re-enable gameObject
        gameObject.SetActive(true);
    }
}

A detailed documentation on function level can be found here:

The Samples~ folder contains several examples of interaction 🤖:

• SimpleInteraction: Demonstrates a simple interaction with an AI character
• MultipleCharacters: Demonstrates a simple interaction using multiple AI characters
• KnowledgeBaseGame: Simple detective game using a knowledge base to provide information to the LLM based on google/mysteryofthreebots
• ChatBot: Demonstrates interaction between a player and a AI with a UI similar to a messaging app (see image below)
• AndroidDemo: Example Android app with an initial screen with model download progress

To install a sample:

• Open the Package Manager: Window > Package Manager
• Select the LLM for Unity Package. From the Samples Tab, click Import next to the sample you want to install.

The samples can be run with the Scene.unity scene they contain inside their folder.
In the scene, select the LLM GameObject and click the Download Model button to download a default model or Load model to load your own model (see LLM model management).
Save the scene, run and enjoy!

LLM for Unity implements a model manager that allows to load or download LLMs and ship them directly in your game.
The model manager can be found as part of the LLM GameObject:

You can download models with the Download model button.
LLM for Unity includes different state of the art models built-in for different model sizes, quantised with the Q4_K_M method.
Alternative models can be downloaded from HuggingFace in the .gguf format.
You can download a model locally and load it with the Load model button, or copy the URL in the Download model > Custom URL field to directly download it.
If a HuggingFace model does not provide a gguf file, it can be converted to gguf with this online converter.

The chat template used for constructing the prompts is determined automatically from the model (if a relevant entry exists) or the model name.
If incorrecly identified, you can select another template from the chat template dropdown.

Models added in the model manager are copied to the game during the building process.
You can omit a model from being built in by deselecting the "Build" checkbox.
To remove the model (but not delete it from disk) you can click the bin button.
The the path and URL (if downloaded) of each added model is diplayed in the expanded view of the model manager access with the >> button:

You can create lighter builds by selecting the Download on Build option.
Using this option the models will be downloaded the first time the game starts instead of copied in the build.
If you have loaded a model locally you need to set its URL through the expanded view, otherwise it will be copied in the build.

❕ Before using any model make sure you check their license ❕

• Show/Hide Advanced Options Toggle to show/hide advanced options from below
• Log Level select how verbose the log messages are

• Remote select to provide remote access to the LLM

• Port port to run the LLM server (if Remote is set)

• Num Threads number of threads to use (default: -1 = all)

• Num GPU Layers number of model layers to offload to the GPU. If set to 0 the GPU is not used. Use a large number i.e. >30 to utilise the GPU as much as possible. Note that higher values of context size will use more VRAM. If the user's GPU is not supported, the LLM will fall back to the CPU

• Debug select to log the output of the model in the Unity Editor

• Advanced options

  • Parallel Prompts number of prompts that can happen in parallel (default: -1 = number of LLMCharacter objects)
  • Dont Destroy On Load select to not destroy the LLM GameObject when loading a new Scene

• Download model click to download one of the default models

• Load model click to load your own model in .gguf format

• Download on Start enable to downloaded the LLM models the first time the game starts. Alternatively the LLM models wil be copied directly in the build

• Advanced options

  • Download lora click to download a LoRA model in .bin format
  • Load lora click to load a LoRA model in .bin format
  • Context Size size of the prompt context (0 = context size of the model)

    This is the number of tokens the model can take as input when generating responses. Higher values use more RAM or VRAM (if using GPU).
  • Batch Size batch size for prompt processing (default: 512)
  • Model the path of the model being used (relative to the Assets/StreamingAssets folder)
  • Chat Template the chat template being used for the LLM
  • Lora the path of the LoRA being used (relative to the Assets/StreamingAssets folder)

• Advanced options

• Base Prompt a common base prompt to use across all LLMCharacter objects using the LLM

• Show/Hide Advanced Options Toggle to show/hide advanced options from below
• Log Level select how verbose the log messages are

• Remote whether the LLM used is remote or local
• LLM the LLM GameObject (if Remote is not set)
• Hort ip of the LLM (if Remote is set)
• Port port of the LLM (if Remote is set)
• Save save filename or relative path

  If set, the chat history and LLM state (if save cache is enabled) is automatically saved to file specified.
  The chat history is saved with a json suffix and the LLM state with a cache suffix.
  Both files are saved in the [persistentDataPath folder of Unity](https://docs.unity3d.com/ScriptReference/Application-persistentDataPath.html).
• Save Cache select to save the LLM state along with the chat history. The LLM state is typically around 100MB+.
• Debug Prompt select to log the constructed prompts in the Unity Editor

• Player Name the name of the player
• AI Name the name of the AI
• Prompt description of the AI role

• Stream select to receive the reply from the model as it is produced (recommended!).
  If it is not selected, the full reply from the model is received in one go

• Advanced options

  • Load grammar click to load a grammar in .gbnf format
  • Grammar the path of the grammar being used (relative to the Assets/StreamingAssets folder)
  • Cache Prompt save the ongoing prompt from the chat (default: true)

    Saves the prompt while it is being created by the chat to avoid reprocessing the entire prompt every time
  • Seed seed for reproducibility. For random results every time use -1
  • Num Predict maximum number of tokens to predict (default: 256, -1 = infinity, -2 = until context filled)

    This is the maximum amount of tokens the model will maximum predict. When N tokens are reached the model will stop generating. This means words / sentences might not get finished if this is too low.
  • Temperature LLM temperature, lower values give more deterministic answers (default: 0.2)

    The temperature setting adjusts how random the generated responses are. Turning it up makes the generated choices more varied and unpredictable. Turning it down makes the generated responses more predictable and focused on the most likely options.
  • Top K top-k sampling (default: 40, 0 = disabled)

    The top k value controls the top k most probable tokens at each step of generation. This value can help fine tune the output and make this adhere to specific patterns or constraints.
  • Top P top-p sampling (default: 0.9, 1.0 = disabled)

    The top p value controls the cumulative probability of generated tokens. The model will generate tokens until this theshold (p) is reached. By lowering this value you can shorten output & encourage / discourage more diverse outputs.
  • Min P minimum probability for a token to be used (default: 0.05)

    The probability is defined relative to the probability of the most likely token.
  • Repeat Penalty control the repetition of token sequences in the generated text (default: 1.1)

    The penalty is applied to repeated tokens.
  • Presence Penalty repeated token presence penalty (default: 0.0, 0.0 = disabled)

    Positive values penalize new tokens based on whether they appear in the text so far, increasing the model's likelihood to talk about new topics.
  • Frequency Penalty repeated token frequency penalty (default: 0.0, 0.0 = disabled)

    Positive values penalize new tokens based on their existing frequency in the text so far, decreasing the model's likelihood to repeat the same line verbatim.
  • Tfs_z: enable tail free sampling with parameter z (default: 1.0, 1.0 = disabled).
  • Typical P: enable locally typical sampling with parameter p (default: 1.0, 1.0 = disabled).
  • Repeat Last N: last N tokens to consider for penalizing repetition (default: 64, 0 = disabled, -1 = ctx-size).
  • Penalize Nl: penalize newline tokens when applying the repeat penalty (default: true).
  • Penalty Prompt: prompt for the purpose of the penalty evaluation. Can be either null, a string or an array of numbers representing tokens (default: null = use original prompt).
  • Mirostat: enable Mirostat sampling, controlling perplexity during text generation (default: 0, 0 = disabled, 1 = Mirostat, 2 = Mirostat 2.0).
  • Mirostat Tau: set the Mirostat target entropy, parameter tau (default: 5.0).
  • Mirostat Eta: set the Mirostat learning rate, parameter eta (default: 0.1).
  • N Probs: if greater than 0, the response also contains the probabilities of top N tokens for each generated token (default: 0)
  • Ignore Eos: enable to ignore end of stream tokens and continue generating (default: false).

The license of LLM for Unity is MIT (LICENSE.md) and uses third-party software with MIT and Apache licenses (Third Party Notices.md).