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Favicon for assemblyai

AssemblyAI: Universal-3.5 Pro

assemblyai/universal-3-5-pro

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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 accepts WAV and compressed input (MP3, M4A, AAC, Ogg/Opus, FLAC, and WebM) and supports free-text prompting, keyterms, and conversation context to steer transcription toward domain vocabulary.

Modalities
Price
from $0.000083/second
Released
Sep 22, 2026
Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

Explore more models

Best Speech-to-Text and Transcription ModelsCollectionTranscription Model RankingsRanking
Latency
$0.0000830.68s
100.00%
ProviderAudio /sec
LatencyUptime
  • Favicon for AssemblyAI
    Audio $0.000083
    Latency 0.68sUptime 100.00%
Latency
0.68s

P50, best provider

Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.99%

Availability over the last 3 days

Last 72 hours
Availability 99.99%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.99%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

1.
Favicon for https://tektorpro.com.br/
Tektor
new
0tokens
2.
Favicon for https://github.com/dreamweald/maia-bench
maia-bench
new
0tokens
3.
Favicon for https://nscribe.nguyensieu.vn/
NScribe
new
0tokens
4.
Favicon for https://vowen.app/
Vowen
new
0tokens
5.
Favicon for https://agent-z-platform.com/
Quadrante
new
0tokens

No chart data available

Frequently asked questions

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 accepts WAV and compressed input (MP3, M4A, AAC, Ogg/Opus, FLAC, and WebM) and supports free-text prompting, keyterms, and conversation context to steer transcription toward domain vocabulary.

Universal-3.5 Pro costs $0.000083/second for Audio Seconds and $0.000097/second for Audio Seconds (Prompted).

Universal-3.5 Pro accepts audio as input and returns transcribed text.

Universal-3.6 Pro is another transcription model from AssemblyAI.

Universal-3.5 Pro was released on September 22, 2026.

More models from AssemblyAI

TTS 1

AssemblyAI TTS 1 is a text-to-speech model from AssemblyAI. It is suited for voice agents, narration, and multilingual applications, and draws on a public library of several thousand voices across languages. Voices are selected by slug or ID, and the spoken language follows the chosen voice or can be set explicitly through the language provider option.

Speech$15/M characters
Universal-3.6 Pro

Universal-3.6 Pro is AssemblyAI's speech-to-text model and the successor to Universal-3.5 Pro, served here through AssemblyAI's Sync API. Compared with Universal-3.5 Pro, AssemblyAI reports 30% fewer errors on short conversational utterances, 12% fewer errors on average across supported languages, 14 newly supported languages, and better recognition and formatting of entities such as phone numbers, addresses, emails, and codes. It returns a complete transcript with word-level timestamps in a single synchronous response for audio up to 20 minutes, accepts WAV and compressed input (MP3, M4A, AAC, Ogg/Opus, FLAC, and WebM), and supports free-text prompting, keyterms, and conversation context to steer transcription toward domain vocabulary.

Transcriptionfrom $0.000083/second