---
title: Spark-X2.5-4B Code Assistant
emoji: 💻
colorFrom: indigo
colorTo: blue
sdk: gradio
sdk_version: 6.15.1
app_file: app.py
python_version: "3.12"
startup_duration_timeout: 1h
short_description: Streaming coding assistant powered by Spark-X2.5-4B.
---

# 💻 Spark-X2.5-4B Code Assistant

A streaming code-assistant demo for
[XHToken/Spark-X2.5-4B](https://huggingface.co/XHToken/Spark-X2.5-4B), a compact
general-purpose language model with strong coding, reasoning, agentic, and
multilingual ability.

The app runs the model directly in a Hugging Face **ZeroGPU** Space. It is tuned
for programming tasks — write, explain, debug, refactor, test, and translate code
— with task presets, a configurable system prompt, sampling controls, and an
optional collapsible `<think>` reasoning trace.

## Features

- **Streaming responses** via `TextIteratorStreamer`, so code appears as it is generated.
- **Reasoning trace** toggle — inspect Spark's `enable_thinking` chain-of-thought.
- **Task presets** — general coding, write, explain, debug & fix, refactor, tests, translate.
- **Markdown code rendering** with copy button, plus a copyable reasoning panel.
- Exposed as an **MCP server** (`mcp_server=True`), so each handler is callable as a tool.

## Notes

- The model is loaded with the official Transformers configuration, chat template,
  and custom `spark2_5` architecture (`trust_remote_code=True`) from its repository.
- Inference uses `bfloat16` on the temporary ZeroGPU allocation, with the eager
  attention implementation required by the model's custom attention path.
- Context is capped at 32,768 tokens here to keep interactive requests practical;
  the model itself supports a much larger native context window.
- Defaults follow the model card: `temperature=1.0`, `top_p=0.95`, thinking on.

## License

This demo code is Apache-2.0. The underlying model is released under its
[Apache-2.0 license](https://huggingface.co/XHToken/Spark-X2.5-4B).