Soniox vs AssemblyAI
for Serbian speech-to-text

Q: How accurate is AssemblyAI in Serbian compared to Soniox?

In 2025 benchmarks, AssemblyAI had an 36.6 % WER on Serbian speech, versus 8.1 % for Soniox. Expect even greater gains in Serbian , especially with messy, real-world audio.

Higher accuracy, real-time fluency, and two-way translation for Serbian at lower cost.

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Developers choose Soniox for real-time fluency in Serbian

Serbian is spoken by 12 million people worldwide — across Serbia, Bosnia and Herzegovina, Montenegro, and beyond. For developers, delivering accurate, real-time transcription and translation in Serbian is critical. Soniox provides production-ready transcription and two-way translation for Serbian, handling regional accents, code-switching, and messy real-world audio.

AssemblyAI is known for simple-to-use APIs, but when it comes to Serbian transcription, Soniox outperforms with higher accuracy in real-world audio, true real-time streaming with token-level output in milliseconds, and global coverage with built-in translation across 60+ languages (including Serbian) in one API.

Cleaner transcripts

Soniox delivers 8.1% WER in Serbian vs 36.6% for AssemblyAI, meaning more accurate Serbian transcripts with less cleanup.

One API for 60+ languages

Transcribe and translate Serbian and 60+ other languages in real-time or async, without stitching multiple APIs.

Streaming that feels instant

Token-level results in milliseconds make Serbian conversations fast, fluid, and human.

Helping startups and enterprises ship real world voice apps

See the difference for yourself

Don't just take our word for it. Run the same Serbian audio through Soniox and AssemblyAI in real-time and compare live results, side by side.

This demo isn't pre-recorded. It makes real API calls to AssemblyAI and Soniox in real-time, with each service tuned for its best performance. The framework is open source, so you can inspect or run it yourself.

SONIOX VS ASSEMBLYAI AT A GLANCE

The benchmarks back it up

In a 2025 study across 60 languages and real-world YouTube audio, Soniox reached 8.1% WER in Serbian vs 36.6% for AssemblyAI.

View benchmark report

Feature	Sonioxstt-rt-v4	AssemblyAIUniversal
open_in_newSingle Multilingual Model	check	close^*
open_in_newLanguage Hints	check	close
open_in_newLanguage Identification	check	close
open_in_newSpeaker Diarization	check	close^*
open_in_newCustomization	check	close^*
open_in_newTimestamps	check	check
open_in_newConfidence Scores	check	check
open_in_newTranslation One Way	check	close
open_in_newTranslation Two Way	check	close
open_in_newEndpoint Detection	check	check
open_in_newManual Finalization	check	check
open_in_newSovereign Cloud	check	warning^*

Pay up to 3x less than AssemblyAI

With Soniox, transcription, streaming, translation, diarization, timestamps, and confidence are all included in one price. AssemblyAI charges more for their flagship Universal models, while their lower-cost Nano models come with tradeoffs in accuracy.

Effective hourly cost

(typical speech)

Soniox

~$0.10/hour (async)
~$0.12/hour (streaming)

AssemblyAI

~$0.27 (universal async), ~$0.15/hr (streaming), ~$0.12/hr (nano async)

100 hours

1,000 hours

10,000 hours

Soniox (async)

~$10

~$100

~$1,000

Soniox (streaming)

~$12

~$120

~$1,200

AssemblyAI (nano)

~$12

~$120

~$1,200

AssemblyAI (universal)

~$27

~$170

~$1,700

AssemblyAI (streaming)

~$15

~$150

~$1,500

Takeaway

Soniox costs up to 3x less than AssemblyAI, while including translation and richer real-time features out of the box. AssemblyAI's cheaper models cut accuracy, while Soniox includes full accuracy and features at one flat rate.

Soniox bills per token, which works out to the effective hourly rates above for typical conversational speech.
AssemblyAI pricing varies by model. Nano is cheaper but sacrifices accuracy; Universal is higher accuracy but more expensive.
All comparisons use publicly listed rates as of 2025.

Why teams choose Soniox over AssemblyAI for Serbian

Understand every word in Serbian and every other language.

Soniox delivers native-speaker accuracy in Serbian and 60+ languages, even with accents, dialects, noise, or mid-sentence language shifts. Transcripts are production-ready, right out of the box.

"It just gets the words right — any language, any accent, any context. That’s what accuracy is supposed to look like."

Tony Wang,
Cofounder & Chief Revenue Officer at Agora

AssemblyAI lags behind in accuracy, especially on messy or non-English audio.

Real-time that doesn’t cut corners.

With token-level updates in milliseconds, Soniox delivers real-time Serbian transcription and translation without sacrificing accuracy. No lag, no jumps, just smooth, natural speech.

"It’s so fast, captions appear before people even finish talking. Zero lag. No buffering. Nothing."

Dag-Inge Aas,
Head of AI at Tana

AssemblyAI processes Serbian in chunks, breaking the flow and hurting responsiveness.

Designed for messy, multilingual conversations.

People interrupt, overlap, and code-switch. Soniox automatically handles mixed-language sentences, Serbian accents, speaker shifts, and conversation flow.

"Soniox knows who’s speaking and when each thought ends. The real-time transcripts read like true dialogue, not data dumps."

Adam Strom,
Co-Founder & President at Mobius MD

AssemblyAI can’t reliably detect language shifts or handle overlapping Serbian speech.

Built-in domain intelligence.

Soniox adapts to your field – healthcare, finance, law, and more – recognizing terminology and enforcing translations without custom models.

"Soniox's ability to accurately transcribe complex medical terminology means our physician-customers spend significantly less time editing. This allows them to finalize their notes faster and focus on what matters most: patient care."

Max Malyk,
Vice President at DeliverHealth

AssemblyAI lacks live domain adaptation or translation control.

Global-ready from the start.

One API handles real-time Serbian transcription, any-to-any translation, language detection, speaker separation, and more, in 60+ languages. No stitching services together.

AssemblyAI only handles transcription, so you’ll need extra tools for multilingual support.

In-region performance for Serbian.

Soniox runs locally in multiple global regions, keeping all Serbian audio and transcripts within jurisdictional boundaries while maintaining consistent real-time accuracy and model quality.

AssemblyAI primarily operates from centralized US regions. Regional residency and sovereignty options for Serbian workloads are limited or require bespoke enterprise arrangements.

Frequently asked questions about Soniox vs AssemblyAI

How accurate is AssemblyAI in Serbian compared to Soniox?arrow_downward

In 2025 benchmarks, AssemblyAI had an 36.6% WER on Serbian speech, versus 8.1% for Soniox. Expect even greater gains in Serbian, especially with messy, real-world audio.

Does AssemblyAI support Serbian translation?arrow_downward

No. AssemblyAI only provides transcription. If you need translation, you'll have to integrate a separate service. Soniox includes two-way real-time translation across 60+ languages in the same API.

How fast is AssemblyAI's streaming?arrow_downward

AssemblyAI streams in chunks, which can add noticeable lag in Serbian conversations. Soniox streams token-by-token in milliseconds, so conversations feel natural and responsive.

What about multilingual or messy audio?arrow_downward

AssemblyAI is built for transcription only. It doesn't support automatic language identification, speaker diarization, or endpoint detection in real-time. Soniox includes all of these by default, so it works better in real-world, multilingual conversations.

How does AssemblyAI pricing compare to Soniox?arrow_downward

AssemblyAI's lower-end models are roughly similar in price, but Universal costs nearly 3× more. Soniox stays flat at ~$0.10–0.12/hr with all features included.

Why is Soniox more cost-efficient?arrow_downward

With Soniox, all features are included by default – transcription, translation, diarization, timestamps, and confidence. AssemblyAI charges more for Universal models while still only offering transcription, meaning you'd need additional services to match Soniox's end-to-end coverage.

Soniox surpasses AssemblyAI in any language

Get the most accurate, real-time speech-to-text transcription and translation in 60+ languages

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Soniox vs AssemblyAI for Serbian speech-to-text