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bytedance/seed-asr-2.0
Seed ASR 2.0
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Seed ASR 2.0 API by ByteDance

bytedance/seed-asr-2.0
Seed-asr-2.0

BytePlus Seed Speech recording-file recognition (ASR 2.0): transcribe an audio file to text with punctuation, ITN, sentence segmentation, speaker diarization, and 51-language support.

Seed ASR 2.0 (Recording-File Recognition)

Seed ASR 2.0 (BytePlus Seed Speech) transcribes an audio file into text. Built on an audio-conditioned LLM, it delivers state-of-the-art accuracy with punctuation, inverse text normalization, sentence segmentation and speaker diarization.

🌟 Key Features

🗣 High-Accuracy Transcription

LLM-based recognition with deep context understanding — strong on dynamic, real-world speech.

🌍 51 Languages

Chinese, English and domestic dialects (Cantonese, Shanghainese, Sichuanese, etc.) plus 48 more including Japanese, Spanish, Portuguese, Arabic, Hindi.

🎯 Rich Output

Punctuation, ITN (number normalization), semantic smoothing, per-sentence timestamps, and speaker diarization (up to 10 speakers).

📻 Far-Field Optimized

~50% error-rate reduction on far-field test sets (speakers, TVs, glasses).

⚙️ Parameters

ParameterRequiredDescription
audio_url*Audio file URL or Base64. Formats: wav/mp3/ogg/raw.
formatAudio format: mp3 (default) / wav / ogg / raw.
languageLanguage code (e.g. en-US, yue-CN); empty = auto (CN/EN/dialects). 51 languages.
enable_itnInverse text normalization. Default true.
enable_puncAdd punctuation. Default false.
enable_ddcSemantic smoothing. Default false.
enable_speaker_infoSpeaker diarization. Default false.
show_utterancesPer-sentence segments + timestamps. Default false.

📤 Output

outputs[0] contains the recognized transcript text.

🎯 Use Cases

  • Meeting & Interview Transcription — turn recordings into searchable text.
  • Media Subtitling — transcribe podcasts/videos with timestamps.
  • Voice Analytics — call-center QA, speaker diarization.
  • Multilingual Content — transcribe across 51 languages.

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