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universal-2

Name: universal-2
Brand: AssemblyAI
Availability: InStock

universal-2 is a speech to text tool from AssemblyAI that runs in the background and returns structured JSON. Pay as you go from $0.000003612 per second, with one API key.

Try itfrom $0.000003612 / second

Pricing

$0.195 per hour of audio. Optional features add, per hour: speaker labels $0.026, key terms $0.065, translation $0.078, speaker identification $0.026, custom formatting $0.039, action items $0.026, summaries $0.026 ($0.091 at medium effort), entity detection $0.104, sentiment $0.026, key phrases $0.013, topic detection $0.195, content moderation $0.195, profanity filter $0.013, PII redaction $0.104, audio redaction $0.065, medical mode $0.195, chapters $0.104, older summarization $0.039. Measured from the input file, for each audio channel with multichannel on. The final charge comes from usage.

Limits

Runs: In the background
Returns: json
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`audio_url` required	URL or file	—	The URL of the audio or video file to transcribe.
`domain`	one of medical-v1	—	Enable domain-specific transcription models to improve accuracy for specialized terminology.
`topics`	list	—	This parameter does not currently have any functionality attached to it.
`punctuate`	true or false	true	Enable [Automatic Punctuation](https://www.assemblyai.com/docs/pre-recorded-audio), can be true or false
`redact_pii`	true or false	false	Redact PII from the transcribed text using the Redact PII model, can be true or false.
`format_text`	true or false	true	Enable [Text Formatting](https://www.assemblyai.com/docs/pre-recorded-audio), can be true or false
`temperature`	number 0 to 1	—	Control the amount of randomness injected into the model's response. Only takes effect on Universal-3.5 Pro, so Universal-2 ignores it.
`audio_end_at`	number (whole)	—	The point in time, in milliseconds, to stop transcribing in your media file.
`disfluencies`	true or false	false	Transcribe [Filler Words](https://www.assemblyai.com/docs/pre-recorded-audio/include-filler-words), like "umm", in your media file; can be true or false.
`multichannel`	true or false	false	Enable [Multichannel](https://www.assemblyai.com/docs/pre-recorded-audio/transcribe-multiple-audio-channels) transcription, can be true or false.
`summary_type`	one of bullets, bullets_verbose, gist, headline, paragraph	—	The type of summary.
`auto_chapters`	true or false	—	Enable [Auto Chapters](https://www.assemblyai.com/docs/speech-understanding/auto-chapters), can be true or false.
`custom_topics`	true or false	—	This parameter does not currently have any functionality attached to it.
`language_code`	JSON	—	The language of your audio file.
`summarization`	true or false	—	Enable [Summarization](https://www.assemblyai.com/docs/speech-understanding/summarization), can be true or false.
`summary_model`	one of informative, conversational, catchy	—	The model to summarize the transcript.
`content_safety`	true or false	false	Enable [Content Moderation](https://www.assemblyai.com/docs/content-moderation), can be true or false
`iab_categories`	true or false	false	Enable [Topic Detection](https://www.assemblyai.com/docs/speech-understanding/topic-detection), can be true or false
`language_codes`	list	—	The language codes of your audio file. Used for [Code switching](/speech-to-text/pre-recorded-audio/code-switching) One of the values specified must be `en`.
`redact_pii_sub`	one of entity_name, hash	—	The replacement logic for detected PII, can be `entity_name` or `hash`. See [PII redaction](https://www.assemblyai.com/docs/pii-redaction) for more details.
`speaker_labels`	true or false	false	Enable [Speaker diarization](https://www.assemblyai.com/docs/pre-recorded-audio/label-speakers), can be true or false. Requires `punctuate` to be `true`.
`auto_highlights`	true or false	false	Enable [Key Phrases](https://www.assemblyai.com/docs/speech-understanding/key-phrases), either true or false
`custom_spelling`	JSON	—	Customize how words are spelled and formatted using to and from values.
`keyterms_prompt`	list	—	Improve accuracy with up to 200 (for Universal-2) or 1000 (for Universal-3.5 Pro) domain-specific words or phrases (maximum 6 words per phrase).
`speaker_options`	JSON	—	Specify options for [Speaker diarization](https://www.assemblyai.com/docs/pre-recorded-audio/label-speakers#set-a-range-of-possible-speakers).
`audio_start_from`	number (whole)	—	The point in time, in milliseconds, to begin transcribing in your media file.
`entity_detection`	true or false	false	Enable [Entity Detection](https://www.assemblyai.com/docs/speech-understanding/entity-detection), can be true or false
`filter_profanity`	true or false	false	Filter profanity from the transcribed text, can be true or false.
`redact_pii_audio`	true or false	false	Generate a copy of the original media file with spoken PII "beeped" out, can be true or false.
`speech_threshold`	number 0 to 1	—	Reject audio files that contain less than this fraction of speech.
`speakers_expected`	number (whole)	—	Tells the speaker label model how many speakers it should attempt to identify.
`language_detection`	true or false	—	[Automatic language detection](https://www.assemblyai.com/docs/pre-recorded-audio/language-detection) identifies the spoken language and routes the request to the best model.
`sentiment_analysis`	true or false	false	Enable [Sentiment Analysis](https://www.assemblyai.com/docs/speech-understanding/sentiment-analysis), can be true or false. Requires `punctuate` to be `true`.
`redact_pii_policies`	list	—	The list of PII Redaction policies to enable. See [PII redaction](https://www.assemblyai.com/docs/pii-redaction) for more details.
`speech_understanding`	JSON	—	Enable speech understanding tasks like [Translation](https://www.assemblyai.com/docs/speech-understanding/translation), [Speaker Identification](https://www.assemblyai.com/docs/speech-understanding/speaker-identification), and [Custom Formatting](https://www.assemblyai.com/docs/speech-understanding/custom-formatting).
`redact_static_entities`	JSON	—	A map of user-defined terms to redact, where each key is a redaction label and each value is a list of exact terms to match (e.g. `{ "INTERNAL_TOOL": ["Bearclaw", "Cubclaw"] }`).
`redact_pii_audio_options`	JSON	—	Specify options for [PII redacted audio](https://www.assemblyai.com/docs/pii-redaction#request-for-redacted-audio) files.
`redact_pii_audio_quality`	one of mp3, wav	—	Controls the filetype of the audio created by redact_pii_audio.
`content_safety_confidence`	number (whole) 25 to 100	—	The confidence threshold for the [Content Moderation](https://www.assemblyai.com/docs/content-moderation) model.
`language_detection_options`	JSON	—	Specify options for [Automatic Language Detection](https://www.assemblyai.com/docs/pre-recorded-audio/language-detection).
`redact_pii_return_unredacted`	true or false	—	When set to `true`, returns the original unredacted transcript alongside the redacted one in the same response.
`language_confidence_threshold`	number 0 to 1	—	The confidence threshold for the automatically detected language.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "assemblyai",
    "model": "universal-2",
    "input": {
      "audio_url": "<audio_url>"
    }
  }'