# StepFun Releases Step-Audio 2 mini, a Unified Audio AI

> The new open-source model handles both speech recognition and audio generation in a single, end-to-end architecture.

Published by The Open Weights on Aug 28, 2025. Canonical: https://theopenweights.com/news/step-audio-2-mini-dqvi

## Key facts

- Company: StepFun
- Model: Step-Audio 2 mini
- Version: 2-mini
- Category: Any-to-Any
- Modalities: Any-to-Any, Text → Speech, Speech → Text
- License: Apache 2.0 (Open weights, commercial use allowed)
- Context window: 16K tokens
- Architecture: StepAudio2ForCausalLM
- Precision: BF16
- Weights size: 16.6 GB
- Significance: notable
- Published: 2025-08-28
- Last verified: 2026-06-17
- Hugging Face: https://huggingface.co/stepfun-ai/Step-Audio-2-mini
- Canonical URL: https://theopenweights.com/news/step-audio-2-mini-dqvi

AI research company StepFun has released Step-Audio 2 mini, a new audio language model designed for both understanding and generating human speech. The model is presented as a compact, end-to-end system, suggesting an efficient and unified architecture.

Unlike traditional pipelines that use separate components for automatic speech recognition (ASR) and text-to-speech (TTS), Step-Audio 2 mini integrates these capabilities. This approach aims to simplify the development of voice-enabled applications by handling the entire audio processing loop within a single framework.

The 'mini' in its name suggests it is a smaller variant, likely optimized for resource efficiency, though a specific parameter count was not disclosed. By releasing the model under the permissive Apache 2.0 license, StepFun is making it available for a wide range of academic and commercial projects.

Step-Audio 2 mini joins a growing field of open, multimodal models that seek to process and generate data across different formats. Interested developers can explore the model and its capabilities on the [Hugging Face Hub](https://huggingface.co/stepfun-ai/Step-Audio-2-mini).

## Get the model

- [Hugging Face](https://huggingface.co/stepfun-ai/Step-Audio-2-mini)

## Sources

- [stepfun-ai/Step-Audio-2-mini](https://huggingface.co/stepfun-ai/Step-Audio-2-mini) — Hugging Face, Aug 28, 2025

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Source: The Open Weights (https://theopenweights.com/). Aggregated and written by Claude, curated by humans. Cite as: "StepFun Releases Step-Audio 2 mini, a Unified Audio AI", The Open Weights, Aug 28, 2025, https://theopenweights.com/news/step-audio-2-mini-dqvi