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stepfun-asr

Transcribes Chinese/English audio with StepFun's stepaudio-3-asr-max via its SSE endpoint (not /v1/audio/transcriptions) — one call handles long-form audio with no chunking. Use when migrating from step-asr/stepaudio-2.5-asr, or hitting the misleading "model not supported" error (actually wrong endpoint). Triggers on 阶跃 ASR, 语音识别. Not for TTS with the sibling model (use stepfun-tts).

daymade-audio/stepfun-asr/SKILL.md

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Nov 6, 2026
License
MIT

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# StepFun stepaudio-3-asr-max

Transcribe audio with StepFun's `stepaudio-3-asr-max` (StepAudio 3, released 2026-09-15, verified 2026-09-16; supersedes `stepaudio-2.5-asr` on the same endpoint). Long audio in one call, no chunking — but **only** if the request hits the right endpoint with the right body shape. The wrong endpoint returns an error that looks identical to "model doesn't exist", which is the #1 reason this skill exists.

> Companion: for TTS with `stepaudio-3-tts` (the sibling model), use the `stepfun-tts` skill — they share an API key but live on different endpoints with different body shapes.

## Why this skill exists — three traps that cost hours

1. **Wrong endpoint, wrong error**. `stepaudio-3-asr-max` does **not** live on `/v1/audio/transcriptions` (that endpoint serves the older `step-asr` family). It lives on `/v1/audio/asr/sse` — SSE streaming, JSON body, base64 audio. Sending it to the wrong endpoint returns `{"error":{"message":"model stepaudio-3-asr-max not supported"}}`, which is **identical in structure** to a genuinely nonexistent model name. People waste hours filing whitelist tickets.

2. **Subscription endpoint vs wallet endpoint**. Step Plan supports `stepaudio-2.5-asr` at `https://api.stepfun.com/step_plan/v1/audio/asr/sse`; the wallet endpoint serves `stepaudio-3-asr-max`. Choose the endpoint and supported model together. Do not infer that Plan is text-only or that changing only a key changes the billing account.

3. **SSE error events are real**. Censorship can fire on the ASR side too (rarely). Don't assume only `transcript.text.delta` and `transcript.text.done` events arrive — handle `type: error` events in the stream or you'll silently drop them.