Soniox vs AssemblyAI
for Turkish speech-to-text

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

In 2025 benchmarks, AssemblyAI had an 1.74 % WER on Turkish speech, versus 1.25 % for Soniox. Expect even greater gains in Turkish , especially with messy, real-world audio.

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

Soniox vs AssemblyAI pricing, side by side

AssemblyAI and most speech-to-text APIs charge extra for diarization, translation, and multilingual support, so the headline rate hides the real bill. Soniox is one flat rate with all of it included. Set your monthly hours below to calculate your all-in cost per hour and see how Soniox compares to AssemblyAI, side by side.

Pricing calculator

Stop overpaying for speech AI

SonioxvsAssemblyAI

1,000 hours of audio / month

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Pricing assumptions

Based on public pay-as-you-go pricing. Enterprise discounts and committed-use contracts may differ. Some providers charge separately for certain features. The calculator uses the public price for the provider configuration that most closely matches Soniox.

Why pick Soniox over AssemblyAI for Turkish

Understand every word in Turkish and every other language.

Soniox delivers native-speaker accuracy in Turkish 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 Turkish 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 Turkish 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, Turkish 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 Turkish speech.

Built-in domain intelligence.

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

"Soniox captures complex medical terminology with high accuracy, helping physicians finalize notes faster and focus on 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 Turkish 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 Turkish.

Soniox runs locally in multiple global regions, keeping all Turkish 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 Turkish workloads are limited or require bespoke enterprise arrangements.

SONIOX VS ASSEMBLYAI AT A GLANCE

The benchmarks back it up

In a 2026 study across 60 languages and real-world YouTube audio, Soniox reached 1.25% WER in Turkish vs 1.74% for AssemblyAI.

View benchmark report

Feature	Sonioxstt-rt-v5	AssemblyAIUniversal
Single Multilingual Model		?
Language Hints
Language Identification
Speaker Diarization		?
Customization		?
Timestamps
Confidence Scores
Translation One Way
Translation Two Way
Endpoint Detection
Manual Finalization
Sovereign Cloud		?

Trusted by teams building global voice products

Developers choose Soniox for real-time fluency in Turkish

Turkish is spoken by 80 million people worldwide — across Turkey, Cyprus, and beyond. For developers, delivering accurate, real-time transcription and translation in Turkish is critical. Soniox provides production-ready transcription and two-way translation for Turkish, handling regional accents, code-switching, and messy real-world audio.

AssemblyAI is known for simple-to-use APIs, but when it comes to Turkish 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 Turkish) in one API.

Cleaner transcripts

Soniox delivers 1.25% WER in Turkish vs 1.74% for AssemblyAI, meaning more accurate Turkish transcripts with less cleanup.

One API for 60+ languages

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

Streaming that feels instant

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

Soniox surpasses AssemblyAI in any language

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

Frequently asked questions about Soniox vs AssemblyAI

How accurate is AssemblyAI in Turkish compared to Soniox?

In 2025 benchmarks, AssemblyAI had an 1.74% WER on Turkish speech, versus 1.25% for Soniox. Expect even greater gains in Turkish, especially with messy, real-world audio.

Does AssemblyAI support Turkish translation?

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?

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

What about multilingual or messy audio?

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?

AssemblyAI's lower-end models are roughly similar in price, but U3 Pro streaming with diarization costs nearly 5× more. Soniox stays flat at ~$0.10–0.12/hr with all features included.

Why is Soniox more cost-efficient?

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.

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