Transcribe Audio: AssemblyAI action

Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

Field	Type	Required	Description
Audio URL audio_url	string	Required	(defaults to AssemblyAI's sample news.mp4)
Model speech_models	array	Optional	Model. Options: Best (slower, accurate), Nano (fast) (array of model names)
Speaker Labels speaker_labels	boolean	Optional	Speaker Labels. Options: No, Yes
Language Code language_code	string	Optional	Language Code

Sample request

{
  "audio_url": "https://example.com/audio.mp3",
  "speech_models": "{{trigger.speech_models}}",
  "speaker_labels": "{{trigger.speaker_labels}}",
  "language_code": "{{trigger.language_code}}"
}

Returns

{
  "id": "trans-abc123",
  "status": "queued",
  "language_code": "en"
}

Use these fields in downstream nodes for routing, logging, or error handling.

FAQ

Questions about Transcribe Audio.

What does the Transcribe Audio action do in AssemblyAI?

Submits an audio URL for transcription with options for speaker diarization, language detection, sentiment analysis, PII redaction, custom vocabulary. Returns the transcript ID; processing takes ~25% of audio duration on the Best tier.

What inputs does Transcribe Audio require?

Required: Audio URL. Every input accepts a static value or a variable from any upstream node in your workflow.

Can I use dynamic inputs from earlier workflow nodes?

Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.

What happens if AssemblyAI returns an error?

The workflow pauses on the failed node, the error message is captured in the run log, and you can retry the run with one click. Auto-retry policies are configurable per workflow with exponential backoff up to 5 attempts.

Does Transcribe Audio support batch operations?

Yes. Run Transcribe Audio inside a Loop node to process arrays. Tiny Command handles AssemblyAI's rate limits automatically so you don't have to throttle manually.

More actions

Other AssemblyAI actions.

Action

Get Transcript

Returns the transcript by ID with the full text, word-level timestamps, speaker labels (if diarization was on), sentiment per utterance (if enabled), and the AI-generated summary. Poll until status=completed or pair with the transcript-ready webhook.

Action

LeMUR Task on Transcript

Runs an LLM task (summarise, Q&A, extract structured data) against one or more completed transcripts. Saves the chain of "fetch transcript → LLM call" by bundling both server-side. Useful for "summarise this call, extract action items as JSON" post-call workflows.

How do I start an AssemblyAI transcription?

The fields this action accepts.

Apps that pair well as the trigger for Transcribe Audio.

Questions about Transcribe Audio.

Other AssemblyAI actions.

Send transcribe audio from your workflows.