Soniox vs Speechmatics speech-to-text

Higher accuracy, live streaming, and built in translation in one API.

Developers choose Soniox for real-time fluency worldwide

Speechmatics provides multilingual transcription with customization features like entity formatting and vocabulary controls. It's a capable transcription service, and for some use cases, that can be a good fit.

But when you need accuracy that holds up in real conversations, streaming that feels live, and translation built in, Soniox is the stronger choice. With one API covering 60+ languages, Soniox is designed for production apps that need to work everywhere.

Leading accuracy

Soniox delivers cleaner transcripts on real conversations, not just controlled audio. Benchmarks show 6.5% WER in English vs ~11–12% for Speechmatics.

Zero delay

Token-level updates keep captions flowing and assistants responsive. Speechmatics streams in larger chunks, which makes apps feel delayed.

Unified API

Soniox handles both transcription and two-way translation across 60+ languages in the same call. Speechmatics only covers transcription.

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 Speechmatics in real-time and compare live results, side by side.

This demo isn't pre-recorded. It makes real API calls to Speechmatics 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 SPEECHMATICS 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 11-12% for Speechmatics.

View benchmark report

Feature	Sonioxstt-rt-v4	Speechmaticsrealtime-enhanced
open_in_newSingle Multilingual Model	check	close
open_in_newLanguage Hints	check	close
open_in_newLanguage Identification	check	close
open_in_newSpeaker Diarization	check	check
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	close
open_in_newManual Finalization	check	close
open_in_newSovereign Cloud	check	warning^*

Pay 2-3x less than Speechmatics

With Soniox, transcription, translation, diarization, timestamps, and confidence are all included in one price. Speechmatics charges more per hour and only covers transcription. Translation requires another service.

Effective hourly cost

(typical speech)

Soniox

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

Speechmatics

~$0.25–0.35/hour depending on model and volume

100 hours

1,000 hours

10,000 hours

Soniox (async)

~$10

~$100

~$1,000

Soniox (streaming)

~$12

~$120

~$1,200

Speechmatics (typical)

~$25-35

~$250-350

~$2,500-3,500

Takeaway

Soniox costs 2–3x less than Speechmatics, while also including translation, diarization, and other features by default.

Soniox bills per token, which works out to the effective hourly rates above for typical conversational speech.
Speechmatics pricing varies by model and volume tier, but charges per minute/hour for transcription only.
All comparisons use publicly listed rates as of 2025.

Why teams choose Soniox over Speechmatics

Get every word right, in every language.

Soniox delivers native-speaker accuracy across 60+ languages, with proven performance on noisy audio, overlapping speakers, dialects, and mid-sentence language switches. No model tuning required; it just works in the real world.

"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

Speechmatics supports ~50 languages, but accuracy varies widely, especially outside of English or clean audio. It struggles with speaker overlap, accents, and code-switching in real conversation.

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

Fast. Precise. Always in sync.

Soniox transcribes and translates speech as it’s spoken, with token-level updates and near-zero latency. Transcripts stay in sync. Assistants respond naturally. Nothing gets lost in the stream.

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

Dag-Inge Aas,
Head of AI at Tana

Speechmatics supports streaming but lags behind. No token-level control or early finalization, so transcripts jump or fall out of sync, especially with fast speakers or frequent interruptions.

Understand conversations, not just words.

Real conversations aren’t clean or scripted. Soniox handles rapid speaker turns, overlaps, pauses, and mixed-language exchanges, all in real time. With built-in diarization and smart endpoint detection, it keeps up with natural dialogue as it happens.

"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

Speechmatics supports speaker labels after the fact, but lacks real-time diarization and nuanced understanding of conversational flow.

Built-in domain intelligence.

Soniox adapts to your domain in real time, recognizing technical terms, product names, acronyms, and industry phrasing. You can even steer translations and enforce the vocabulary that matters most.

"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

Speechmatics offers no domain awareness or dynamic vocabulary control. Accuracy depends on pretraining, with no ability to guide how key terms are rendered.

All features. One API. Global by default.

Soniox includes transcription, any-to-any translation, speaker separation, language detection, and domain control. All in one stream, one call, and no stitching required.

Speechmatics lacks built-in translation, speaker separation, or context control. These must be added with external tools or post-processing, creating more complexity and latency.

Global compliance. Local performance.

Soniox delivers the same model, accuracy, and latency in every region where it’s deployed. All data stays in-region with no tradeoffs in speed or quality.

Speechmatics supports VPC and on-prem deployments, but regional presence is limited and often requires custom setup that can affect speed and model parity.

Frequently asked questions about Soniox vs Speechmatics

Is Soniox cheaper than Speechmatics?arrow_downward

Yes. Soniox costs ~$0.10–0.12/hr, while Speechmatics typically charges ~$0.25–0.35/hr depending on model and volume. That makes Soniox about 2–3x less expensive.

Does Speechmatics support translation?arrow_downward

No. Speechmatics provides transcription only. Soniox includes two-way, in-stream translation across 60+ languages in the same API call.

How does Soniox streaming compare to Speechmatics?arrow_downward

Soniox streams token by token in milliseconds, with refinements, manual finalization, and endpoint detection. Speechmatics streams in larger segments, which can feel slower for live use cases.

Does Speechmatics support diarization and timestamps?arrow_downward

Yes, but Soniox provides them in real-time with more structured outputs.

Can Soniox handle multiple languages in one stream?arrow_downward

Yes. Soniox auto-detects and supports mid-conversation shifts. Speechmatics requires you to pre-select a single language per request.

Soniox surpasses Speechmatics in any language

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