Capabilities
Explore what Universal-3.5 Pro supports, then use the API section for a request tailored to this model.
Languages
Model Information
- Provider
- AssemblyAI
- Product
- Speech-to-Text
- Release Date
- Jul 7, 2026
- Data Policy
- Not specified
- Region
- US
- Input
- Audio
- Output
- Text
Playground
Try Universal-3.5 Pro by AssemblyAI. Requests use the selected workspace’s credits and API pricing.
Providers
Compare available endpoints, pricing, and context limits for Universal-3.5 Pro.
| Provider | Context | Output | Input Price | Output Price | Endpoint |
|---|---|---|---|---|---|
| AssemblyAI | Not specified | Text | $0.003 / minute | — | assemblyai/universal-3.5-pro:assemblyai |
Prices are catalog rates. Your workspace’s estimate and endpoint pricing determine the final charge.
Input and Output Limits
Formats and limits AudioLab enforces on each request.
| Limit | Value |
|---|---|
| Max bytes | Not specified |
| Max seconds | 3600 |
| Formats | mp3, mp4, wav, m4a, flac |
Provider Notes
Universal 3.5 Pro, Universal 3 Pro, and Universal 2 are asynchronous batch products. assemblyai/universal-3.5-pro-realtime streams with AssemblyAI's Universal-3.5 Pro (speech_model universal-3-5-pro); Whisper Realtime and both Universal Streaming variants are also streaming-only products with separate prices and parameter sets. Realtime language is selected by the speech model or language_detection—language_code is a pre-recorded-only field. AudioLab rejects Universal-3.5 Pro prompting and voice-focus controls on the other realtime models.
Performance
Status
Current catalog availability. Your workspace’s access is checked separately before a request runs.
A live availability check is not available right now.
Getting Started
Use your workspace API key and the exact model identifier below. Set the API URL to the endpoint shown in your workspace and keep credentials on your server.
curl "$AUDIOLAB_API_URL/v1/audio/transcriptions" \
-H "Authorization: Bearer $AUDIOLAB_API_KEY" \
-F 'model=assemblyai/universal-3.5-pro' \
-F 'file=@recording.wav'Request Parameters
Available parameters depend on the provider and request format. The endpoint reference explains accepted values and required fields.
| Parameter | Details |
|---|---|
model | assemblyai/universal-3.5-pro — Required model identifier. |
audio_start_from / audio_end_at | View Accepted Values |
language_codes / language_detection / language_detection_options | View Accepted Values |
custom_spelling / auto_highlights / entity_detection | View Accepted Values |
content_safety / iab_categories / sentiment_analysis / speech_understanding | View Accepted Values |
multichannel / speakers_expected / speaker_options | View Accepted Values |
redact_pii* / redact_static_entities | View Accepted Values |
punctuate / format_text / filter_profanity / disfluencies | View Accepted Values |
webhook_url / webhook auth fields (batch) | View Accepted Values |
agent_context / voice_focus / prompt / mode (Universal-3.5 Pro Streaming) | View Accepted Values |
turn silence and confidence controls (realtime) | View Accepted Values |
language_detection / max_speakers (realtime) | View Accepted Values |
Input and Output Limits
Formats and limits AudioLab enforces on each request.
| Limit | Value |
|---|---|
| Max bytes | Not specified |
| Max seconds | 3600 |
| Formats | mp3, mp4, wav, m4a, flac |
Similar Models
Explore more speech-to-text and compare their capabilities.
| Model | Context | Input Price | Output Price |
|---|---|---|---|
| Universal-3.5 Pro SyncAssemblyAI | Not specified | $0.0064 / minute | — |
| Universal-3.5 Pro RealtimeAssemblyAI | Not specified | $0.0064 / minute | — |
| Whisper RealtimeAssemblyAI | Not specified | $0.0021 / minute | — |
| Universal-3 ProAssemblyAI | Not specified | $0.003 / minute | — |
| Universal-Streaming (Multilingual)AssemblyAI | Not specified | $0.0021 / minute | — |
| Universal-Streaming (English)AssemblyAI | Not specified | $0.0021 / minute | — |