Soniox vs Azure speech-to-text

Higher accuracy, real-time translation, and simpler integration than Microsoft Azure Speech-to-Text.

Developers choose Soniox for accuracy sans complexity

While Microsoft Azure Speech-to-Text supports a number of languages and integrates tightly into the Microsoft ecosystem, developers are often faced with tradeoffs. Azure STT also comes with lower accuracy in real-world audio, higher latency in streaming, and extra complexity stitching together speech, translation, and custom speech services.

Soniox delivers all-in-one transcription and translation with higher accuracy, token-level streaming, and full developer control. One API handles transcription, two-way translation, diarization, timestamps, and confidence. All with simpler pricing and no hidden add-ons.

Higher accuracy in real-world speech

Soniox delivers production-ready accuracy on real-world speech: 6.5% WER vs Azure's ~13–14%.

Streaming that feels live

Apps feel smooth and human with token-level updates, refinements, and full transcript control.

One API for transcription + translation

Build faster with transcription + two-way translation included in one call. Azure requires separate Translator and Custom Speech.

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 audio through Soniox and Azure in real-time and compare live results, side by side.

This demo isn't pre-recorded. It makes real API calls to Azure 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 AZURE AT A GLANCE

The benchmarks back it up

In a 2025 study across 60 languages and real-world YouTube audio, Soniox reached 6.5% WER in English vs ~13-14% for Azure.

View the full benchmark report

Feature	Sonioxstt-rt-v3	Azureen-US-Conversation
open_in_newSingle Multilingual Model	check	close
open_in_newLanguage Hints	check	close
open_in_newLanguage Identification	check	warning^*
open_in_newSpeaker Diarization	check	warning
open_in_newCustomization	check	check
open_in_newTimestamps	check	check
open_in_newConfidence Scores	check	check
open_in_newTranslation One Way	check	check
open_in_newTranslation Two Way	check	close
open_in_newEndpoint Detection	check	check
open_in_newManual Finalization	check	close

Pay 2-5x less than Azure

With Soniox, transcription, translation, diarization, timestamps, and confidence are all included in one price. Azure charges more per hour and requires multiple services (Speech-to-Text + Translator + Custom Speech) for the same functionality.

Effective hourly cost

(typical speech)

Soniox

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

Azure

~$0.24–0.48/hour (depending on region/model)

100 hours

1,000 hours

10,000 hours

Soniox (async)

~$10

~$100

~$1,000

Soniox (streaming)

~$12

~$120

~$1,200

Azure

~$24-48

~$240-480

~$2,400-4,800

Takeaway

Soniox costs 2–5x less than Azure, with all features included in one API. At scale, that means saving thousands while reducing integration overhead.

Soniox bills per token, which works out to the effective hourly rates above for typical speech.
Azure pricing varies by region, model, and usage tier. Translation via Azure Translator is billed separately, and Custom Speech may add further costs.
Comparisons use publicly listed rates as of 2025. Benchmarks and pricing are based on real-world audio workloads, with each service configured for best available performance.

Why teams choose Soniox over Azure

Engineered for real-world accuracy.

Soniox delivers production-grade accuracy on messy, real-world audio – overlapping speakers, mixed-language phrases, spelled names and numbers, and natural pauses. WER in English: 6.5% vs Azure’s ~13–14%.

"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

Azure’s accuracy drops outside clean, well-separated audio – it struggles with real conversation dynamics and fast-paced inputs.

Speaking Super Fast in Italian – Soniox still translated every word into English

Shockingly precise in ultra real time.

Soniox transcribes and translates as you speak – with token-level updates, real-time finalization, and fluent results from the first word.

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

Dag-Inge Aas,
Head of AI at Tana

Azure streams in segments, with no token-level visibility, delayed finalization, and robotic transitions that throw off real-time apps.

Understand the rhythm of real speech

Soniox detects who’s talking, when they’ve paused, and when a sentence ends, giving structure to unscripted conversations. Speaker separation, turn-taking, and sentence boundaries come built in.

"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

Azure lacks real-time conversational intelligence, and requires additional configuration or post-processing for diarization.

Build once. Deploy everywhere.

One model, one API, one call – Soniox includes language detection, speaker separation, translation, and more by default. Build once in the language you know and reach billions of users everywhere, instantly.

Azure splits features across separate APIs like STT, Translator, and Custom Speech, each with their own costs, formats, and complexity.

Built-in domain intelligence.

Soniox understands industry-specific terminology, product phrasing, and user vocabulary, adapting on the fly without custom training. You can even steer translations and enforce terms that matter.

"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

Azure requires setting up Custom Speech, adding static hints, and still lacks real-time control or guaranteed accuracy.

Fluent at any speed

Watch Soniox keep up with fast speech in any language

Chinese to English in real-time

Very fast speaking Spanish translated in real-time in English

Real time translation from Japanese to English

Real-Time Translation Demo | From German to English

French speech to Text | Leslie Talks About Monster eating a Cake

Russian to English

Speaking Super Fast in Italian – Soniox still translated every word into English

Korean to English in real-time

Real-Time from Slovenian to English

Valeria Juri Reads Ukrainian Poem “Мовчати” | Live English Translation

Frequently asked questions about Soniox vs Azure

1.Is Soniox cheaper than Azure?arrow_downward

Yes. Soniox costs ~$0.10–0.12/hr. Azure costs ~$0.24–0.48/hr depending on region and model, plus extra for translation/customization.

2.Does Azure support more languages than Soniox?arrow_downward

Azure lists 100+, but accuracy is inconsistent. Soniox supports 60+ with production-ready accuracy and built-in two-way translation.

3.Do I need multiple APIs with Azure?arrow_downward

Yes. Azure typically requires combining Speech-to-Text, Translator, and Custom Speech. Soniox includes everything in one call.

4.Does Azure support diarization and timestamps?arrow_downward

Yes, but Soniox provides them faster and in real time.

5.Can Soniox handle multiple languages in one stream?arrow_downward

Yes. Soniox auto-detects and supports mid-conversation shifts. Azure requires pre-selecting one language per request.

6.Does Azure support two-way translation?arrow_downward

No. Azure requires Translator as a separate service and typically supports one-way flows. Soniox delivers two-way, in-stream translation in the same API call.

Soniox surpasses Azure in any language

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

Build faster with one API

Start building

Create your account and generate an API key to get started instantly.

Get API key

Explore the docs

Find guides, API reference, and code samples to help you build fast.

docs_add_onView docs

Join our Discord

Ask questions, get feedback, and connect with other builders.

Join us