Gladia x pyannoteAI: Speaker diarization and the future of voice AI

Published on Mar 11, 2025
Gladia x pyannoteAI: Speaker diarization and the future of voice AI

Speaker recognition is advancing rapidly. Beyond merely capturing what is said, it reveals who is speaking and how they communicate, paving the way for more advanced communication platforms and assistant apps

Jean-Louis Queguiner, CEO at Gladia, met our partners at pyannoteAI, a leading provider of cutting-edge speaker diarization and identification models, to explore how speaker insights are continuing to evolve and contribute to better transcription accuracy and analytics.

Feel free to watch the webinar directly or read through a summary of key insights shared below.

What is speaker diarization?

Speaker diarization is the process of identifying and segmenting different speakers in an audio recording. As Hervé Bredin, the creator of the Pyannote open-source library, explained, it is a unique and complex machine learning problem. Unlike traditional supervised learning tasks, diarization must determine the number of speakers dynamically, cluster their voices, and handle overlapping speech.

With Pyannote, an open-source tool widely used in the speech AI community, and pyannoteAI, a commercial product offering enhanced diarization accuracy and speed, speaker identification is becoming more accessible and reliable than ever.

The evolution of pyannoteAI

Pyannote started as an open-source project designed to make speech research reproducible and accessible. Today, it has grown into an essential component of voice AI, with over 100,000 unique users and 30 million downloads per month on Hugging Face.

When OpenAI released Whisper in 2022, Pyannote's popularity surged as it became the go-to tool for speaker diarization alongside Whisper’s transcription capabilities. This demand led to the creation of pyannoteAI, a commercial solution that offers improved performance, reduced computation time, and enterprise-grade support.

Why speaker diarization matters

Speaker diarization has a profound impact on multiple industries, including:

  • Speech-to-text & meeting notes: Companies like Circleback use pyannoteAI to accurately transcribe meetings, distinguishing different speakers for better insights.
  • Dubbing & localization: pyannoteAI helps streamline the dubbing process by ensuring the right voice is assigned to the correct character.
  • Voice AI training: AI models, such as Moshy by QAI, leverage Pyannote for clean, speaker-separated datasets, ensuring higher accuracy in voice recognition systems.
  • Sales & customer support: Diarization plays a crucial role in call analytics and CRM integrations, ensuring that customer interactions are correctly attributed.
  • Healthcare & legal transcription: Misattributed speech can have critical consequences. In medical settings, diarization ensures accuracy in doctor-patient interactions.

Challenges & innovations in speaker diarization

Despite its benefits, speaker diarization is one of the hardest problems in machine learning due to several challenges:

  • Handling overlapping speech: Real-world conversations involve interruptions and overlaps. pyannoteAI has made significant progress in detecting and distinguishing overlapping speakers.
  • Real-time diarization: While offline diarization is well-optimized, real-time processing is still evolving. pyannoteAI is actively developing a streaming solution to power live captioning and voice assistants.
  • Speaker re-identification: Gladia is experimenting with speaker tracking across multiple recordings using embedding-based recognition, allowing seamless continuity in multi-session interactions.
  • Background noise & audio quality: Background noise, music, and different audio formats impact diarization accuracy. pyannoteAI continuously improves robustness against such factors.

The future of speaker insights

Audio intelligence is advancing, with speaker diarization playing a critical role. Jean-Louis from Gladia highlighted that every day, people generate the equivalent of a Tolkien book in spoken words. Unlocking insights from this vast data pool requires more than just transcription—it demands accurate speaker identification, emotion detection, and contextual understanding.

Key trends shaping the future of speech AI include:

  • Voice agents: AI-powered voice agents will revolutionize customer service, sales, and virtual assistants by providing real-time, speaker-aware responses.
  • Prosody & emotion recognition: Understanding not just words, but how they are spoken, will enhance AI interactions.
  • Non-speech vocalization: Detecting laughter, sighs, and hesitations will add another layer of intelligence to voice AI.
  • AI-powered personalization: AI systems will tailor interactions based on voice traits, improving accessibility and user experience.

Final thoughts

Speaker diarization is no longer just a niche problem; it is essential for the future of voice intelligence. Companies like Gladia and pyannoteAI are pushing the boundaries of what’s possible, making voice AI more accurate, efficient, and insightful.

As voice technology continues to evolve, speaker insights will become just as valuable as the words themselves. Whether it’s improving customer service, enhancing transcription accuracy, or creating lifelike AI assistants, diarization will be at the heart of the voice AI revolution.

If you're interested in integrating pyannoteAI or Gladia’s solutions into your workflow, now is the time to explore the possibilities!

Want to learn more? Watch the full webinar recording and reach out to Gladia or pyannoteAI for partnership opportunities.

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