NVIDIA Unveils Parakeet-TDT-0.6B-v2: A Breakthrough in Open-Source Speech Recognition

 On May 1, 2025, NVIDIA released Parakeet-TDT-0.6B-v2, a state-of-the-art automatic speech recognition (ASR) model, now available on Hugging Face. This open-source model is designed to deliver high-speed, accurate transcriptions, setting a new benchmark in the field of speech-to-text technology.

Exceptional Performance and Speed

Parakeet-TDT-0.6B-v2 boasts 600 million parameters and utilizes a combination of the FastConformer encoder and TDT decoder architectures. When deployed on NVIDIA's GPU-accelerated hardware, the model can transcribe 60 minutes of audio in just one second, achieving a Real-Time Factor (RTFx) of 3386.02 with a batch size of 128. This performance places it at the top of current ASR benchmarks maintained by Hugging Face. 

Comprehensive Feature Set

The model supports:

• Punctuation and Capitalization: Enhances readability of transcriptions.

• Word-Level Timestamping: Facilitates precise alignment between audio and text.

• Robustness to Noise: Maintains accuracy even in varied noise conditions and telephony-style audio formats.

These features make it suitable for applications such as transcription services, voice assistants, subtitle generation, and conversational AI platforms. 

Training Data and Methodology

Parakeet-TDT-0.6B-v2 was trained on the Granary dataset, comprising approximately 120,000 hours of English audio. This includes 10,000 hours of high-quality human-transcribed data and 110,000 hours of pseudo-labeled speech from sources like LibriSpeech, Mozilla Common Voice, YouTube-Commons, and Librilight. NVIDIA plans to make the Granary dataset publicly available following its presentation at Interspeech 2025. 

Accessibility and Deployment

Developers can deploy the model using NVIDIA’s NeMo toolkit, compatible with Python and PyTorch. The model is released under the Creative Commons CC-BY-4.0 license, permitting both commercial and non-commercial use. It is optimized for NVIDIA GPU environments, including A100, H100, T4, and V100 boards, but can also run on systems with as little as 2GB of RAM. 

Implications for the AI Community

The release of Parakeet-TDT-0.6B-v2 underscores NVIDIA's commitment to advancing open-source AI tools. By providing a high-performance, accessible ASR model, NVIDIA empowers developers, researchers, and enterprises to integrate cutting-edge speech recognition capabilities into their applications, fostering innovation across various industries.