Basics

Text Completions

Use llm.complete(...) to generate text completions from a loaded language model. Text completions mean sending a non-formatted string to the model with the expectation that the model will complete the text.

This is different from multi-turn chat conversations. For more information on chat completions, see Chat Completions.

1. Instantiate a Model

First, you need to load a model to generate completions from. This can be done using the top-level llm convenience API, or the model method in the llm namespace when using the scoped resource API. For example, here is how to use Qwen2.5 7B Instruct.

import lmstudio as lms

model = lms.llm("qwen2.5-7b-instruct")

2. Generate a Completion

Once you have a loaded model, you can generate completions by passing a string to the complete method on the llm handle.

# The `chat` object is created in the previous step.
result = model.complete("My name is", config={"maxTokens": 100})

print(result)

3. Print Prediction Stats

You can also print prediction metadata, such as the model used for generation, number of generated tokens, time to first token, and stop reason.

# `result` is the response from the model.
print("Model used:", result.model_info.display_name)
print("Predicted tokens:", result.stats.predicted_tokens_count)
print("Time to first token (seconds):", result.stats.time_to_first_token_sec)
print("Stop reason:", result.stats.stop_reason)

Both the non-streaming and streaming result access is consistent across the synchronous and asynchronous APIs, as prediction_stream.result() is a non-blocking API that raises an exception if no result is available (either because the prediction is still running, or because the prediction request failed). Prediction streams also offer a blocking (synchronous API) or awaitable (asynchronous API) prediction_stream.wait_for_result() method that internally handles iterating the stream to completion before returning the result.

Example: Get an LLM to Simulate a Terminal

Here's an example of how you might use the complete method to simulate a terminal.

import lmstudio as lms

model = lms.llm()
console_history = []

while True:
    try:
        user_command = input("$ ")
    except EOFError:
        print()
        break
    if user_command.strip() == "exit":
        break
    console_history.append(f"$ {user_command}")
    history_prompt = "\n".join(console_history)
    prediction_stream = model.complete_stream(
        history_prompt,
        config={ "stopStrings": ["$"] },
    )
    for fragment in prediction_stream:
        print(fragment.content, end="", flush=True)
    print()
    console_history.append(prediction_stream.result().content)

Customize Inferencing Parameters

You can pass in inferencing parameters via the config keyword parameter on .complete().

result = model.complete(initial_text, config={
    "temperature": 0.6,
    "maxTokens": 50,
})

See Configuring the Model for more information on what can be configured.

Progress Callbacks

Long prompts will often take a long time to first token, i.e. it takes the model a long time to process your prompt. If you want to get updates on the progress of this process, you can provide a float callback to complete that receives a float from 0.0-1.0 representing prompt processing progress.

import lmstudio as lms

llm = lms.llm()

completion = llm.complete(
    "My name is",
    on_prompt_processing_progress = (lambda progress: print(f"{progress*100}% complete")),
)

In addition to on_prompt_processing_progress, the other available progress callbacks are:

• on_first_token: called after prompt processing is complete and the first token is being emitted. Does not receive any arguments (use the streaming iteration API or on_prediction_fragment to process tokens as they are emitted).
• on_prediction_fragment: called for each prediction fragment received by the client. Receives the same prediction fragments as iterating over the stream iteration API.
• on_message: called with an assistant response message when the prediction is complete. Intended for appending received messages to a chat history instance.