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/step-audio-editx/

# StepFun Step-Audio-EditX

StepFun, Step-Audio family. Status: current. Type: speech and audio. Released: 2025-11-06.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Hugging Face | `stepfun-ai/Step-Audio-EditX` |  | https://huggingface.co/stepfun-ai/Step-Audio-EditX |
| Hugging Face (4-bit) | `stepfun-ai/Step-Audio-EditX-AWQ-4bit` |  | https://huggingface.co/stepfun-ai/Step-Audio-EditX-AWQ-4bit |
| GitHub |  |  | https://github.com/stepfun-ai/Step-Audio-EditX |

## Pricing

- Price not published.
- Last checked: 2026-09-29

## Specs

- Input: text, audio
- Output: audio
- Context window: not published
- Max output: not published
- Open weights: yes
- Licence: apache-2.0 (code; check model card for weights)

## Where it stands

- Newer speech and audio models in the registry since its release: 80. 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 StepFun: StepAudio 3 Realtime (2026-09-15) https://postcutoff.com/m/stepaudio-3-realtime/
- Weights are public. Licence: Apache-2.0. See the licence for commercial terms.

## What stands out

- Iterative LLM-based audio editing: 3B RL-trained audio LLM that edits emotion, speaking style and paralinguistics of existing speech step by step, plus zero-shot TTS cloning (Mandarin, English, Sichuanese, Cantonese; Japanese/Korean added 2025-11-28). Source: https://github.com/stepfun-ai/Step-Audio-EditX

## Notes

Official changelog lists a new model release on 2026-01-29 (overall ~4% improvement; new paralinguistic tags such as exhale, inhale, chuckle, clears throat, giggle; SFT/DPO/GRPO training code released); HF weights updated 2026-01-23/24, README edits to 2026-02-14. No March 2026 release appears in the official GitHub/HF changelog, so Artificial Analysis's 'Step Audio EditX (Mar 2026)' label (#3 open weights, ~1095 Elo, Sept 2026) probably refers to the Jan 2026 weights or a hosted snapshot (unverified).

Sources: https://github.com/stepfun-ai/Step-Audio-EditX , https://huggingface.co/stepfun-ai/Step-Audio-EditX

Model page: https://postcutoff.com/m/step-audio-editx/