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NVIDIA presenta Nemotron 3.5 Transcribe: un modelo MoE abierto de 30B para la transcripción en 40 idiomas con ~4B parámetros activos

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El modelo abierto Nemotron 3.5 Transcribe de NVIDIA integra la transcripción de voz a texto, la identificación de hablantes y la traducción en un único modelo eficiente, simplificando el procesamiento de audio multilingüe para los desarrolladores.

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NVIDIA has released Nemotron 3.5 Transcribe, an open-weights speech LLM built for transcription. One model handles 40 languages and recordings up to 1 hour. A text instruction picks the output style for each request. Options include verbatim, written form, speaker-attributed, contextual and translated output. For developers, it can replace separate ASR, diarization and alignment tools. TL;DR Size: 34B total and about 4.3B active parameters; 65,536-token context; audio up to 1 hour. Runs on: 1x H100 80 GB in BF16. FP8 (about 35 GB) and NVFP4 (about 21 GB) checkpoints exist; NVFP4 runs on an RTX 5090. GGUF files target NeMo-Speech.cpp. Performance: Best open-weights model on the English and multilingual Open ASR Leaderboards; top commercial APIs still lead. Best: 4.71% mean WER on the 9 public English Open ASR sets (next open model: 4.94%). Worst: 34.95% cpCER on AliMeeting Mandarin far-field meetings. Bottom line: Best thing: 1 open model covers transcripts, speaker labels, timestamps and translation. Worst thing: offline only, with weak Mandarin meeting accuracy. What is Nemotron 3.5 Transcribe? Nemotron 3.5 Transcribe is a speech-augmented language model (SALM) from NVIDIA that turns audio and instructions into text. An audio encoder feeds embeddings into an LLM decoder, which makes transcription promptable. NVIDIA’s technical research report argues there is no single correct transcript. Numbers, fillers and domain terms depend on who reads the output. NVIDIA positions the model as a transcription specialist, not a general-purpose assistant. How does the architecture work? It has three parts: Parallel Expert Encoder: a trainable 0.6B Transformer ASR encoder runs beside a frozen Nemotron 3 Diarization model. The diarizer tracks up to 8 speakers. Its speaker activity is added to the ASR features every 80 ms. The LLM therefore sees who spoke when, without architecture changes. LLM backbone: Nemotron 3.5 Lightning 30B-A3B, a hybrid Mamba-Transformer MoE. I

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