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In addition to hosted and local language models, Open Interpreter also supports custom models. As long as your system can accept an input and stream an output (and can be interacted with via a Python generator) it can be used as a language model in Open Interpreter. Simply replace the OpenAI-compatible completions function in your language model with one of your own: 
def custom_language_model(messages, model, stream, max_tokens):
    """
    OpenAI-compatible completions function (this one just echoes what the user said back).
    To make it OpenAI-compatible and parsable, `choices` has to be the root property.
    The property `delta` is used to signify streaming.
    """
    users_content = messages[-1].get("content") # Get last message's content

    for character in users_content:
        yield {"choices": [{"delta": {"content": character}}]}

# Tell Open Interpreter to power the language model with this function

interpreter.llm.completions = custom_language_model
Then, set the following settings: 
interpreter.llm.context_window = 2000 # In tokens
interpreter.llm.max_tokens = 1000 # In tokens
interpreter.llm.supports_vision = False # Does this completions endpoint accept images?
interpreter.llm.supports_functions = False # Does this completions endpoint accept/return function calls?
And start using it: 
interpreter.chat("Hi!") # Returns/displays "Hi!" character by character