Fact · Languages and accents
18languages
AssemblyAI's documentation says its Universal-3.5 Pro speech-to-text model supports 18 languages, and that audio in other languages falls back to Universal-2 if the request asks for it.
Quote found word for word on the live source, last checked October 19, 2026
In the source's own words
“Universal-3.5 Pro supports the following 18 languages. To automatically fall back to Universal-2 for anything outside this set”
Supported Languages & Features (AssemblyAI documentation), AssemblyAI, 2026, Supported Languages & Features, Universal-3.5 Pro section.
Open the original- What it measures
- AssemblyAI's documentation page listing the languages for each of its speech-to-text models. The fallback applies only when the request names both models in speech_models.
- What it does not show
- The page's Universal-3.5 Pro table has 21 entries, including three English variants, so the stated 18 counts languages and not every table entry. We record the stated total.
In the data
A row of How Many Languages Speech Recognition Supports, as AssemblyAI Universal-3.5 Pro: 18 languages.
- System
- AssemblyAI Universal-3.5 Pro
- Maker
- AssemblyAI
- Kind
- Cloud speech API
- What is counted
- Languages
- On device
- Not stated
- As of
- 2026-10
Source
Used to calculate
- In the languages supported by speech recognition systems dataset, the 10 published figures for “Cloud speech API” have a median of 94 languages, ranging from 13 to 125.
- The languages supported by speech recognition systems dataset holds 45 data points, each a published figure traced to its source.
- The languages supported by speech recognition systems dataset draws on 39 distinct sources.