Soniox vs Deepgram
for Portuguese speech-to-text

Higher accuracy in real-world Portuguese, real-time features, and in-stream translation that Deepgram can't match.

Developers choose Soniox for accuracy in Portuguese speech

Portuguese is spoken by 280 million people worldwide — across Brazil, Portugal, Angola, Mozambique, Guinea-Bissau, Cape Verde, São Tomé and Príncipe, and beyond. Soniox delivers production-ready transcription and translation for Portuguese, handling regional accents, code-switching, and real-world audio conditions. Deepgram lists Portuguese as supported, but benchmark results show far higher error rates compared to Soniox.

Developers often like Deepgram for getting started quickly but often have to sacrifice accuracy, streaming speed, and key features. In real-world Portuguese audio, which can include accents, rapid speech, and overlapping speakers, errors increase, streaming lags, and translation isn't included. Soniox offers one API that transcribes and translates Portuguese (and 60+ others) with higher accuracy and smoother real-time performance, so your app instantly works worldwide.

Trusted accuracy

Soniox outperforms Deepgram on real-world Portuguese speech, so there's less to fix later. Soniox hits 4.8% WER in Portuguese vs 13.4% for Deepgram.

Faster streaming in Portuguese

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

Portuguese translation built in

One API delivers transcription and two-way translation across 60+ languages, including Portuguese. Your app works for 8 billion people worldwide with no extra services required.

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

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

The benchmarks back it up

In a 2025 study across 60 languages and real-world YouTube audio, Soniox reached 4.8% WER in Portuguese vs 13.4% for Deepgram.

View benchmark report

Feature	Sonioxstt-rt-v4	Deepgramnova-3
open_in_newSingle Multilingual Model	check	check
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	close
open_in_newTranslation Two Way	check	close
open_in_newEndpoint Detection	check	warning^*
open_in_newManual Finalization	check	check
open_in_newSovereign Cloud	check	warning^*

Pay 2-3x less than Deepgram

With Soniox, transcription, translation, diarization, timestamps, and confidence are all included in one price. Deepgram charges more per tier and doesn't bundle translation at all.

Effective hourly cost

(typical speech)

Soniox

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

Deepgram

~$0.20–0.40/hour depending on model tier (Nova-2, Nova-3, Enhanced)

100 hours

1,000 hours

10,000 hours

Soniox (async)

~$10

~$100

~$1,000

Soniox (streaming)

~$12

~$120

~$1,200

Deepgram (typical)

~$20-40

~$200-400

~$2,000-4,000

Takeaway

For Portuguese, you'll typically pay 2–3x less than Deepgram, while getting higher accuracy, smoother streaming, and built-in translation out of the box.

Soniox bills per token, which works out to the effective hourly rates above for typical conversational speech.
Deepgram pricing varies by tier: lower-cost "Nova" models are less accurate, while higher-cost "Enhanced" adds expense. Translation requires a separate service.
All comparisons use publicly listed rates as of 2025.

Why teams choose Soniox over Deepgram for Portuguese

Engineered for real-world accuracy in Portuguese.

Soniox delivers production-grade accuracy in Portuguese and 60+ languages. It understands fast, informal, accented speech in Portuguese, and handles mixed-language phrases, spoken codes, and alphanumerics with precision that others miss.

"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

Deepgram’s accuracy drops outside of English, and it struggles with Portuguese accents, code-switching, and real-world inputs like spelled-out names or numbers.

Unmatched speed and precision in Portuguese.

Soniox streams every Portuguese word in real time – accurate from the first sound, fluent to the last. Captions stay in sync, assistants respond instantly, and nothing gets lost mid-sentence.

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

Dag-Inge Aas,
Head of AI at Tana

Deepgram streams by the sentence, not the word, which causes lag and loss of nuance in live applications.

Understand the rhythm of real Portuguese speech.

Soniox knows when someone’s speaking, when they’ve stopped, and who’s talking, with built-in speaker separation, sentence boundary detection, and turn-taking awareness.

"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

Deepgram lacks true conversational intelligence, and doesn’t support diarization in multilingual settings.

One API. Everything built in.

Portuguese transcription, any-to-any translation, speaker separation, mixed-language support – all from a single model, endpoint, and call. Production-ready from day one.

Deepgram splits features across models, with no multilingual or translation support in a single stream.

Instant domain intelligence.

Soniox catches product names, acronyms, technical terms, and can be guided with your terminology — so output fits your users, product, and industry.

"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

Deepgram lacks domain intelligence, and doesn’t support vocab customization or translation control.

In-region performance for Portuguese.

Soniox provides true in-region processing and storage for Portuguese audio across multiple global deployments. Same model, same Portuguese accuracy, same real-time performance.

Deepgram offers EU endpoints, but most processing remains centralized. Additional regions usually require dedicated enterprise deployments, and Portuguese model parity can vary.

Frequently asked questions about Soniox vs Deepgram

Is Soniox cheaper than Deepgram?arrow_downward

Yes. Soniox costs ~$0.10–0.12/hr, while Deepgram typically costs ~$0.20–0.40/hr depending on model tier. That's 2–3x less expensive.

Does Deepgram support Portuguese translation?arrow_downward

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

How does Soniox streaming compare to Deepgram?arrow_downward

Soniox streams token by token in milliseconds, with refinements, manual finalization, and endpoint detection. Deepgram streams by the sentence, creating lag and jumpy transcripts.

Does Deepgram support diarization and timestamps?arrow_downward

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

Can Soniox handle multiple languages in one stream?arrow_downward

Yes. Soniox detects language shifts mid-conversation. Deepgram requires a single language per request.

Soniox surpasses Deepgram in any language

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

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Soniox vs Deepgram for Portuguese speech-to-text