As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/seed-audio-1-0/

# Seed Audio 1.0

ByteDance, Seed family. Status: current. Type: speech and audio. Released: 2026-07-20.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| BytePlus (Seed Speech console) |  |  | https://console.byteplus.com/voice/new/setting/activate?projectName=default |

## Pricing

- Price not published.
- Last checked: not recorded

## Specs

- Input: text, audio
- Output: audio
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 42. The 5 newest:
  - NVIDIA Nemotron 3.5 Transcribe (30B-A4B) (2026-10-28) https://postcutoff.com/m/nemotron-3-5-transcribe/
  - Hy-SimulMT-30B-A3B (2026-10-22) https://postcutoff.com/m/hy-simulmt-30b-a3b/
  - Eleven Realtime v1 Max / Mini (2026-10-20) https://postcutoff.com/m/eleven-realtime-v1-max/
  - Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3) (2026-10-20) https://postcutoff.com/m/voxtral-mini-transcribe-3/
  - Voxtral Small Transcribe 3 (2026-10-20) https://postcutoff.com/m/voxtral-small-transcribe-3/
- After it from ByteDance: SeedRealtime (Doubao realtime audio-visual model) (2026-08-05) https://postcutoff.com/m/seedrealtime/
- Closed weights.

## What stands out

- Unified speech + SFX + ambience generation: Jointly models voice, sound effects and ambience in one framework for film-grade audio; multi-character dialogue with prompt-level timing control at 100 ms precision; up to 2 min per generation with continuation. Source: https://seed.bytedance.com/en/blog/from-speech-to-audio-creation-introducing-the-seed-audio-1-0-audio-creation-model
- 20+ languages: Including zh, en, ja, ko, es, id, de, fr, th, vi; most languages MOS > 4.0 in ByteDance's evaluation. Source: https://seed.bytedance.com/en/seedaudio1_0

## Notes

API model id and pricing not found. Related ByteDance speech stack: Seed-TTS 2.0 / Doubao TTS 2.0 (Oct 2025), Doubao-Seed-ASR-2.0, Seed LiveInterpret 2.0 (2025-07-24, zh<->en simultaneous interpretation with voice cloning, ~2.5-3 s lag; see entry 2025-07-24-bytedance-seed-liveinterpret-2) on Volcengine/BytePlus. Comparable: Qwen-Audio-3.1-TTS-Next, StepAudio 3 Gen.

Sources: https://seed.bytedance.com/en/seedaudio1_0 · https://seed.bytedance.com/en/blog/from-speech-to-audio-creation-introducing-the-seed-audio-1-0-audio-creation-model

Model page: https://postcutoff.com/m/seed-audio-1-0/