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Gladia | Audio Transcription API

**New! Evaluating speech-to-text vendors with Gladia's Buyer's Guide. Get your copy.**

Product

APIs

Real-time STT

First fully multilingual real-time transcription engine with <300ms latency

Batch STT

Asynchronous transcription and add-ons with no hallucinations

MODELS

Solaria

The first truly universal STT — real-time, precise, and fluent in any language.

#### Introducing Solaria

The new model delivers industry-leading accuracy, speed, and native-level transcription in 100+ languages.

Learn more

Solutions

Use Case

Customer experience

Real-time AI to boost productivity of contact center agents

Sales enablement

AI transcription and insights to supercharge sales calls

Meeting assistants

Flawless transcription for LLM-based AI assistants with note-taking capabilities

Media

Streamlined editing and subtitles with time-stamped transcription

Industry

Voice agents

AI-powered productivity for voice-based customer interactions

Contact center as a service (CCaaS)

Flexible AI transcription for scalable contact center solutions

Business process outsourcing (BPO)

Smart transcription tools for efficient outsourced operations

Pricing

Developers

Playground

Explore our APIs with a dedicated playground app

Documentation

All you need to know to get started with Gladia

Discord

Where our community lives

Status

Real-time updates on the status and performance of our services

#### Test Gladia in action

Take a tour of our playground to discover the core API features
and capabilities.

Try for free

Resources

Blog

Read our latest articles about speech-to-text, LLMs and more

Library

Discover our ebooks, webinars, guides, and more

Whisper TCO Calculator

Calculate the cost of ownership of hosting open-source Whisper ASR

Real-time API benchmarks

Comparing Gladia’s performance against pure players

#### STT's buyer's guide

With so many variables at play–from accuracy, speed, languages–it’s easy to get lost. But we’ve got you covered.

Get the copy

Company

About us

Our team and company story

Careers

For current job openings

Press

Our latest press features, media kit and boilerplate

#### Our road to real-time audio AI – with $16M in series A funding

Speed, accuracy, and insight—real-time AI, finally funded to deliver.

Learn more

Request a demo

Sign up

Product

APIs

Speech-to-Text

Asynchronous transcription and add-ons with no hallucinations

Real-Time Streaming

First fully multilingual real-time transcription engine with <300ms latency

MODELS

Solaria

The first truly universal STT — real-time, precise, and fluent in any language.

Whisper-Zero

An open-weight transcription model with near-zero hallucinations for production.

Solutions

Use cases

Customer experience

Real-time AI to boost productivity of contact center agents

Sales enablement

AI transcription and insights to supercharge sales calls

Meeting assistants

Flawless transcription for LLM-based AI assistants with note-taking capabilities

Media

Streamlined editing and subtitles with time-stamped transcription

industry

Voice agents

AI-powered productivity for voice-based customer interactions

CCaaS

Flexible AI transcription for scalable contact center solutions

BPO

Smart transcription tools for efficient outsourced operations

Pricing

Developers

Playground

Explore our APIs with a dedicated playground app

Documentation

All you need to know to get started with Gladia

Discord

Where our community lives

Status

Real-time updates on the status and performance of our services

Resources

Blog

Read our latest articles about speech-to-text, LLMs and more

Library

Latest premium content

Whisper TCO Calculator

Calculate the cost of ownership of hosting open-source Whisper ASR

Company

About us

Our team and company story

Careers

For current job openings

Press

Our latest press features, media kit and boilerplate

Get started

Get started

NEW

**Benchmarks live now**

# The speech-to-text backbone
for voice agents

#### Gladia is the STT engine built for developers. Sub-300ms guaranteed latency, infinite scale, and no infrastructure headaches.

Request a demo

Sign up for free

Trusted by 250,000+ developers worldwide

#### Failed calls kill your business

Gladia API delivers stability and scale to make sure that never happens.

performance

#### Performance that won’t disappoint

In real-time, average latency doesn’t matter – consistent response time does.

Check our benchmarks

Sub-300ms latency

To keep conversations seamless and ensure smooth, uninterrupted dialogue every time.

Leading STT accuracy

Capturing numerical, jargon, and key entities such as names and emails for downstream agent tasks.

Predictable, stable performance

Forget variance spikes to deliver a consistent user experience.

Optimized for SIP

As well as telephony protocols (8 kHz), fitting natively into your existing workflows.

SCALING

#### Scale without thinking

Instant scalability.
No limits, no fine print.

Talk to sales

Infinite parallel streams

No need to forecast, give notice, or over-provision in advance.​​

Zero infra burden

Save at least 20% of DevOps effort without sacrificing latency, with no need to self-host.

Flexible, usage-based pricing

Start small, test freely, scale-as-you-go with clear pricing tiers.

INTEGRATION

#### Developer-first
experience

Plug. Build. Ship.

Gladia documentation

Lightweight SDK

Minimal lines of code to make setup fast and painless.

Fast integration

REST or WebSocket connections are simple to configure in under a day.

Telephony ready

Designed to integrate seamlessly with top communication platforms.

Ecosystem native

Works out-of-the-box with WebRTC, Recall, and more.

Direct support

High-touch Slack access for instant help from engineers building the tech.

GDPR Compliant

HIPAA Compliant

AICPA SOC Type 2

GDPR Compliant

HIPAA Compliant

AICPA SOC Type 2

LANGUAGe SUPPORT

#### 1 provider
for any language

Expand globally with a single API.

Talk to sales

Transcribes in 100 languages

With leading accuracy in EN, FR, ES, and IT, with exclusive support for rare languages.

Advanced code-switching

Advanced recognition handles natural multilingual conversations without errors.

Any-to-any translation

Ensures seamless communication across all supported languages.

#### BENCHMARKS
#### How we compare to alternatives

5%+ more accurate than competitors, improving your processing time by 50%

Check our benchmarks

**Rated 5 on G2**

#### Why customers choose us

Here's what top-tier voice platform builders say about our product

Watch Attention case study

Matthias Winckenburg

CTO & Founder, Attention

"There’s a lot more than one can get out of audio than just transcription, and Gladia understood that. Feature rollouts are proactive, and anticipate our needs as a platform. Their API performs very well with noisy telephony and stereo audio and does an excellent job with languages."

Alexandre Bouju

CTO Deputy Manager

"Gladia has a clear-cut advantage when it comes to European languages. With their API, we acquired new users in countries like Finland and Sweden, who say it's the best transcription they've ever tried."

Lazare Rossillon

CEO

"We are 100% benchmark and evaluation driven. Gladia was one of the best providers selected on merit to transcribe user videos, especially for non-English languages. Their reactive customer support and data compliance make their offer really compelling."

Kojo Hinson

Group Engineering Manager

"It's the first time we've been able to transcribe video with such accuracy and speed - including when the conversation is technical. Whatever the language or accent, the quality is always there."

Robin Bonduelle

CEO

"Having tried numerous speech-to-text solutions, I can confidently say: Gladia's API outshines the rest. Their balance of accuracy, speed, and precise word timings is unparalleled."

Jean Patry

Co-founder

"We initially attempted to host Whisper Al, which required significant effort to scale. Switching to Gladia's transcription service brought a welcome change."

Robin Lambert

CPO

"The quality of the output from our platform, everything that we do based on this transcription became better after we switched to Gladia."

Valentin van Gastel

VP of Product & Engineering

"There’s a lot more than one can get out of audio than just transcription, and Gladia understood that. Feature rollouts are proactive, and anticipate our needs as a platform. Their API performs very well with noisy telephony and stereo audio and does an excellent job with languages."

Alexandre Bouju

CTO Deputy Manager

"It's the first time we've been able to transcribe video with such accuracy and speed - including when the conversation is technical. Whatever the language or accent, the quality is always there."

Robin Bonduelle

CEO

"Having tried numerous speech-to-text solutions, I can confidently say: Gladia's API outshines the rest. Their balance of accuracy, speed, and precise word timings is unparalleled."

Jean Patry

Co-founder

"The quality of the output from our platform, everything that we do based on this transcription became better after we switched to Gladia."

Valentin van Gastel

VP of Product & Engineering

"We are 100% benchmark and evaluation driven. Gladia was one of the best providers selected on merit to transcribe user videos, especially for non-English languages. Their reactive customer support and data compliance make their offer really compelling."

Kojo Hinson

Group Engineering Manager

"Gladia has a clear-cut advantage when it comes to European languages. With their API, we acquired new users in countries like Finland and Sweden, who say it's the best transcription they've ever tried."

Lazare Rossillon

CEO

"We initially attempted to host Whisper Al, which required significant effort to scale. Switching to Gladia's transcription service brought a welcome change."

Robin Lambert

CPO

"Having tried numerous speech-to-text solutions, I can confidently say: Gladia's API outshines the rest. Their balance of accuracy, speed, and precise word timings is unparalleled."

Jean Patry

Co-founder

"The quality of the output from our platform, everything that we do based on this transcription became better after we switched to Gladia."

Valentin van Gastel

VP of Product & Engineering

"Gladia has a clear-cut advantage when it comes to European languages. With their API, we acquired new users in countries like Finland and Sweden, who say it's the best transcription they've ever tried."

Lazare Rossillon

CEO

"We are 100% benchmark and evaluation driven. Gladia was one of the best providers selected on merit to transcribe user videos, especially for non-English languages. Their reactive customer support and data compliance make their offer really compelling."

Kojo Hinson

Group Engineering Manager

"We initially attempted to host Whisper Al, which required significant effort to scale. Switching to Gladia's transcription service brought a welcome change."

Robin Lambert

CPO

"It's the first time we've been able to transcribe video with such accuracy and speed - including when the conversation is technical. Whatever the language or accent, the quality is always there."

Robin Bonduelle

CEO

"There’s a lot more than one can get out of audio than just transcription, and Gladia understood that. Feature rollouts are proactive, and anticipate our needs as a platform. Their API performs very well with noisy telephony and stereo audio and does an excellent job with languages."

Alexandre Bouju

CTO Deputy Manager

#### use cases

#### What you can build with our API

Powering the next generation of AI assistants and voice agents across industries

Customer support

Deliver natural conversations at scale — with agents that answer instantly, never drop a call, and handle thousands of interactions in parallel, inbound and outbound.

transcribed 95% faster with Gladia

Sales enablement

Capture names, emails, and company details across accents and languages, then sync seamlessly into CRMs to supercharge sales teams with top-tier AI assistance.

closed more deals globally. Here's how

Discover Attention case study

Note-takers

Capture every detail automatically — with real-time or async transcription that tags speakers, generates summaries, and more across all your tools.

How Gladia supports note-takers?

Financial services

Run voice agents that can engage customers in sensitive, compliance-heavy contexts, with stable transcription and top numerical accuracy.

How Gladia supports financial services?

#### Voice is the ultimate interface.
We’re here to make it real.

At Gladia, we believe that the future of human–machine interaction is voice. Speaking should be the most natural way to access information, build products, and connect with technology.

Read more

## All your questions. Answered.

What are the key features of Gladia’s audio transcription API?

On top of supporting 100+ languages across both highly accurate asynchronous and real-time transcription, at <300 milliseconds latency, Gladia also offers a layer of add-ons. These range from custom vocabulary, diarization and sentiment analysis to named entity recognition, word-level timestamps, summarization and more.

What languages does Gladia’s speech-to-text API support?

Gladia’s Speech-to-Text API supports 100+ languages and accents: afrikaans, albanian, amharic, arabic, armenian, assamese, azerbaijani, bashkir, basque, belarusian, bengali, bosnian, breton, bulgarian, burmese, castilian, catalan, chinese, croatian, czech, danish, dutch, english, estonian, faroese, finnish, flemish, french, galician, georgian, german, greek, gujarati, haitian, haitian creole, hausa, hawaiian, hebrew, hindi, hungarian, icelandic, indonesian, italian, japanese, javanese, kannada, kazakh, khmer, korean, lao, latin, latvian, letzeburgesch, lingala, lithuanian, luxembourgish, macedonian, malagasy, malay, malayalam, maltese, maori, marathi, moldavian, moldovan, mongolian, myanmar, nepali, norwegian, nynorsk, occitan, panjabi, pashto, persian, polish, portuguese, punjabi, pushto, romanian, russian, sanskrit, serbian, shona, sindhi, sinhala, sinhalese, slovak, slovenian, somali, spanish, sundanese, swahili, swedish, tagalog, tajik, tamil, tatar, telugu, thai, tibetan, turkish, turkmen, ukrainian, urdu, uzbek, valencian, vietnamese, welsh, yiddish, yoru.

How can I get started with implementing Gladia’s API in my product?

Gladia’s API is extremely easy to implement. To get started, sign up at app.gladia.io. You can choose between trying our product in the playground environment or click ‘Home’ and ‘Generate new API key’ straight away. You can find all the information you need in our developer’s documentation.

How does Gladia’s Speech-to-Text API work?

Gladia’s audio transcription API - also called a Speech-to-Text API - allows developers and product owners to add both asynchronous and real-time transcription, as well as a selection of audio intelligence add-ons, to their products by calling on a single API for every audio transcription need. You can find all the information you need in our developer’s documentation. Gladia’s pricing has three tiers: free access, Pay-as-you-Go, and Enterprise. You can find more information on the Pricing page. Gladia’s single API is compatible with all existing tech stacks and telephony protocols, including SIP, VoIP, FreeSwitch and Asterisk.

Do you offer support for multiple programming languages?

Absolutely! Our API is designed to be language-agnostic, meaning you can use it with any programming language that can make HTTP requests. We provide code examples in multiple languages to assist developers in integrating our speech-to-text API.

What audio formats does Gladia support?

Gladia’s audio transcription API supports a wide range of audio formats and codecs, from WAV and m4a to flac and aac. The full list is available in our documentation under "Supported files & duration," but make sure to reach out to our team if you encounter any issues with your specific file format.

What type of companies use Gladia’s audio transcription API?

Any company that manages or produces audio or video data can benefit from Gladia’s Speech-to-Text technology. Among others, we work with: Virtual meeting providers, note-takers and collaboration platforms use audio transcription to help their customers store and exploit vast amounts of meeting data, giving them access to a previously untapped source of internal knowledge. Contact centers, technology providers, sales enablement- and CRM enrichment platforms improve their performance with real-time transcription, detailed analytics and insights, as well as AI voice companies using STT and TTS APIs in their services and selling to businesses that require enhanced communication capabilities. Audio, video, and media production companies like streaming platforms, screencast or podcast production software, media platforms and forums, and audio and video recording or sharing products all use audio and video transcription. Both to make their content exponentially faster to catalog, access and search for, as well as to generate captions and subtitles. Specialized companies in industries such as medicine, law and finance find great value in speech-to-text technology that is fine-tuned to their specific language.

Is Gladia secure?

At Gladia, we are used to working with organizations with highly sensitive data and extremely tight security requirements. By default, we deliver our audio transcription services in a cloud-hosted environment which can be customized to your geographical footprint. We are able to deliver on-premises hosting, as well as air-gapped hosting, depending on your security requirements. As Gladia already operates in Europe with organizations that require airtight data privacy compliance, Gladia is able to offer GDPR-compliant audio transcription.

Product

Speech-to-TextReal-Time StreamingSolariaPricing

Use cases

Customer experienceSales enablementMeeting assistantsMedia

Developers

PlaygroundDocumentationDiscordStatus

Resources

BlogAbout usCareersPressSecurityTrust centerBug Bounty Program

Legal

Terms & conditions | Gladia SASTerms & conditions | Gladia Inc.General terms of use | Gladia SASGeneral terms of use | Gladia Inc.Privacy noticeLegal notice

AI audio infrastructure for companies

GDPR Compliant

HIPAA Compliant

AICPA SOC Type 2

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