assemblyai

AssemblyAI: Universal-3.5 Pro

assemblyai/universal-3-5-pro

Our take

AI-assisted analysis based on the sources below. Suitability is an editorial assessment; test it on your own workload.

According to OpenRouter's catalog, assemblyai/universal-3-5-pro is an AssemblyAI speech-to-text model served through the Sync API. The listing reports a single synchronous response containing a complete transcript with word-level timestamps for audio up to 20 minutes. It accepts audio input and produces transcription output. This evidence is catalog metadata rather than an independent model card or measured evaluation, so accuracy, language coverage, latency, and production fit should be validated on representative workloads.[1]

Strengths

OpenRouter reports synchronous end-to-end transcription in one response.[1]
The catalog lists complete transcripts with word-level timestamps.[1]

Limitations

Only OpenRouter catalog data was supplied; an independent model card was not available in this source pack.[1]
No measured evidence on accuracy, language coverage, latency, robustness, or workload fit was supplied.[1]

Where to use it

Potentially suitable for synchronous transcription of recordings within the catalog's stated 20-minute limit.[1]
Worth evaluating for workflows needing complete transcripts with word-level timing, such as caption alignment or audio navigation, subject to validation.[1]

Sources

[1] OpenRouter catalog · AssemblyAI: Universal-3.5 ProSources checked: Nov 13, 2026

About this model

Description below is the original text supplied by OpenRouter, shown in the source language.

Universal-3.5 Pro is AssemblyAI's speech-to-text model served through its Sync API, returning a complete transcript with word-level timestamps in a single synchronous response for audio up to 20 minutes. It...

Specifications

Model ID: assemblyai/universal-3-5-pro
Canonical ID: assemblyai/universal-3-5-pro-20260914
Creator: assemblyai
Added to OpenRouter: 22.09.2026
Context length: 0
Modality: audio->transcription
Input modalities: audio
Output modalities: transcription
Token pricing: No per-token price in the source snapshot — see OpenRouter for the billing unit
Knowledge cutoff: —
Expiration date: —

Tasks and capabilities

A grade appears only where the source supplies a matching measurement for that task, the model is active and the cohort holds at least 10 comparable models. The capability column lists facts the source declares — supported formats, reasoning and tool parameters — which are not measured quality.

Task	Grade	Source-declared capability
General quality	No measurement	—
Coding	No measurement	—
Agents	No measurement	—
Writing	No measurement	—
Reasoning	No measurement	—
Document analysis	No measurement	—
Vision	No measurement	—
Image generation	No measurement	—
Audio	No measurement	input: audio
Video	No measurement	—
Embeddings	No measurement	—

Evaluations

No evaluations are supplied for this model.

How grades work

Each letter grade compares a model only against other models scored by the same source and metric in the current snapshot. S means the top 10%, A the next 20%, B the next 30%, C the rest. Models without a published measurement are shown as not rated — a supported format alone never implies measured quality.

S — S — top 10% of the cohort
A — A — next 20% of the cohort
B — B — next 30% of the cohort
C — C — below the B band

Providers

Optional live provider statistics from OpenRouter. Missing values are unknown, not zero.

Provider	Context length	Price in /1M	Price out /1M	Latency p50 (30m, s)	Throughput p50 (30m, tok/s)	Uptime (30m)
AssemblyAI	0	—	—	—	—	—

Provider data retrieved: 13.11.2026

No published articles identify this model yet.