HomeSesame Unveils Base AI Model Behind Viral Virtual Assistant Maya
Sesame, the innovative AI company behind the strikingly lifelike voice assistant Maya, has just made waves by releasing the base model that drives her capabilities. Dubbed CSM-1B, this model boasts a size of 1 billion parameters, a term that refers to the individual components making up the model. Released under an Apache 2.0 license, it's open for commercial use with minimal restrictions, as announced on the AI development platform Hugging Face.
CSM-1B functions by converting text and audio inputs into "RVQ audio codes." RVQ stands for "residual vector quantization," a method that transforms audio into discrete tokens, or codes. This technique is also utilized in other cutting-edge AI audio technologies, such as Google's SoundStream and Meta's Encodec. At its core, CSM-1B leverages a model from Meta's Llama family, combined with an audio "decoder" component. A specialized version of CSM-1B, after fine-tuning, powers the voice of Maya, according to Sesame.
Describing the model as a "base generation model" on its Hugging Face and GitHub repositories, Sesame notes that it's designed to produce a variety of voices but hasn't been refined for any specific voice. While it has some ability to handle non-English languages thanks to "data contamination" in its training set, its performance in this area is likely subpar. Interestingly, Sesame has kept the details of the training data under wraps, leaving us curious about what went into building this model.
One aspect that raises eyebrows is the lack of robust safeguards. Sesame operates on an honor system, simply encouraging users and developers to avoid using the model to replicate someone's voice without permission, produce misleading content like fake news, or partake in any "harmful" or "malicious" activities. I personally tested the demo on Hugging Face, and within a minute, I had cloned my voice. It was a breeze to generate speech on any topic, even sensitive ones like the election and Russian propaganda.
Consumer Reports recently highlighted the concerning lack of "meaningful" safeguards in many AI-powered voice cloning tools, which could lead to potential fraud or abuse. Sesame, co-founded by Oculus co-creator Brendan Iribe, caught the public's eye in late February with its assistant tech that nearly escapes the uncanny valley. Both Maya and Sesame's other assistant, Miles, exhibit realistic human-like traits such as taking breaths, speaking with disfluencies, and being interruptible mid-speech, similar to OpenAI's Voice Mode.
Financially, Sesame has secured undisclosed funding from heavyweights like Andreessen Horowitz, Spark Capital, and Matrix Partners. Beyond voice assistants, the company is also venturing into prototyping AI glasses intended for all-day wear, equipped with their custom models. This move shows Sesame's ambition to push the boundaries of AI technology further into our daily lives.
Related article
Stripe to Acquire OpenRouter as AI Model Routing Gains Momentum
Stripe has agreed to acquire OpenRouter, an AI model-routing platform that gives developers access to hundreds of models through a single interface. The deal adds model selection and routing to Stripe’s existing work around AI usage and token-based b
Google AI Overviews Gain Ground in Search Results
According to Similarweb’s 2026 Generative AI Landscape report, Google’s AI-generated summaries appeared in 43% of US searches, a significant rise from 15% recorded a year prior.While AI Overviews present generated summaries within standard search res
Sequoia-backed Empirik raises $21M to forecast outages before they strike
Before joining Sequoia Capital in 2020 as chief digital and information officer, Avon Puri spent over a decade running infrastructure at Rubrik and VMware. Three years ago, as large language models began showing their true potential, Puri, alongside
Related Special Topic Recommendations
Design & Art
Top AI Illustration Tools: Create Editorial Scenes and Cover Art Faster
2026 Latest Top-rated AI Illustration Tools: Our curated list features the best powerfully designed tools for creating stunning editorial scenes and eye-catching cover art quickly. Each option has gone through rigorous real-world tests, offering a free vs paid comparison to help you find the perfect match for your workflow. Try these must-try solutions today to unlock your AI edge and boost your creative productivity. Explore now at XIX.AI.
10 tools
xix.ai
Education and Learning
Top AI Tutors for Exam Prep: Practice Math, Science, and English
2026 Latest Top-Rated Best AI Tutors for Exam Prep are here on XIX.AI! Our curated list features powerful game-changing tools that offer free vs paid comparison, real-world tests, and weekly updated rankings. They help boost your writing efficiency, simplify complex topic learning, and unlock your academic potential. Explore now to Discover your perfect exam prep tool and Start creating today to Unlock your AI edge!
10 tools
xix.ai
Finance
AI Budget Planning Tools for Personal Money Management
2026 Latest Best Top-Rated AI Budget Planning Tools for Personal Money Management are here on XIX.AI! This curated collection features powerful, game-changing solutions that help you conduct real-world tests, understand spending habits, and create personalized plans to boost productivity. Enjoy a free vs paid comparison along with detailed rankings. Must-try tools designed to simplify money management and unlock your AI edge. Explore now!
11 tools
xix.ai
Health & Wellness
AI Sleep Tracking Assistants: Improve Recovery with Better Bedtime Habits
2026 Latest Best Top-Rated AI Sleep Tracking Assistants curated for ultimate recovery. This fully updated weekly guide features powerful tools that deliver real-world tests, free vs paid comparison, and detailed rankings to help you find the must-try solution that boosts sleep quality and supports better bedtime habits. Explore now at XIX.AI to Unlock your AI edge.
10 tools
xix.ai
Data Analysis
AI SQL Copilots for Product and Revenue Analytics
2026 Latest Best Top-Rated AI SQL Copilots for Product and Revenue Analytics! XIX.AI has curated a powerful, game-changing collection of must-try tools that undergo real-world tests through weekly updated rankings. These tools help users boost productivity significantly by accelerating data analysis, streamlining complex queries, and generating accurate insights to drive smarter business decisions. Explore now to Discover your perfect tool for unlocking your AI edge!
14 tools
xix.ai
Education and Learning
Best AI Homework Helpers That Teach: Learn Concepts, Not Just Answers
2026 Latest Best Top-Rated AI Homework Helpers That Teach Core Concepts Not Just Answers Powerful Tools for Students Must-Try Curated List Weekly Updated Free vs Paid Comparison Real-World Tests Accurate Rankings to Help You Unlock Your Full Learning Potential Explore now to Discover your perfect tool for smarter studying.
10 tools
xix.ai
Comments (8)
0/500
![PaulYoung]()
C'est incroyable ce que Sesame a fait avec Maya ! Un modèle à 1 milliard de paramètres, ça doit être une sacrée bête. Mais franchement, ça donne quoi en termes d'éthique ? On va tous finir avec des assistants trop parfaits ? 😅
![AnthonyMartinez]()
Wow, Sesame's CSM-1B sounds like a game-changer! A billion parameters for Maya’s lifelike voice? That’s some serious tech flex. Curious how it stacks up against other models in real-world use. 😎
![RoySmith]()
Whoa, a 1B parameter model powering Maya? That's some serious brainpower! Curious how Sesame's CSM-1B stacks up against other AI giants. Excited to see where this tech takes us! 🚀
![EricPerez]()
Sesame's base AI model for Maya is mind-blowing! 1 billion parameters? That's insane! Maya's voice is so lifelike, it's like talking to a real person. But sometimes she gets a bit too chatty, which can be annoying. Still, a fantastic piece of tech! 🤯
![GeorgeMiller]()
¡El modelo base de IA de Sesame para Maya es alucinante! ¿1 billón de parámetros? ¡Eso es una locura! La voz de Maya es tan realista, parece que estoy hablando con una persona real. Pero a veces se pone un poco parlanchina, lo que puede ser molesto. Aún así, una tecnología fantástica! 🤯
![JonathanMiller]()
Das Basis-AI-Modell von Sesame für Maya ist umwerfend! 1 Milliarde Parameter? Das ist verrückt! Mayas Stimme ist so lebensecht, es fühlt sich an, als würde man mit einer echten Person sprechen. Aber manchmal wird sie ein bisschen zu gesprächig, was nervig sein kann. Trotzdem, eine fantastische Technologie! 🤯
Sesame, the innovative AI company behind the strikingly lifelike voice assistant Maya, has just made waves by releasing the base model that drives her capabilities. Dubbed CSM-1B, this model boasts a size of 1 billion parameters, a term that refers to the individual components making up the model. Released under an Apache 2.0 license, it's open for commercial use with minimal restrictions, as announced on the AI development platform Hugging Face.
CSM-1B functions by converting text and audio inputs into "RVQ audio codes." RVQ stands for "residual vector quantization," a method that transforms audio into discrete tokens, or codes. This technique is also utilized in other cutting-edge AI audio technologies, such as Google's SoundStream and Meta's Encodec. At its core, CSM-1B leverages a model from Meta's Llama family, combined with an audio "decoder" component. A specialized version of CSM-1B, after fine-tuning, powers the voice of Maya, according to Sesame.
Describing the model as a "base generation model" on its Hugging Face and GitHub repositories, Sesame notes that it's designed to produce a variety of voices but hasn't been refined for any specific voice. While it has some ability to handle non-English languages thanks to "data contamination" in its training set, its performance in this area is likely subpar. Interestingly, Sesame has kept the details of the training data under wraps, leaving us curious about what went into building this model.
One aspect that raises eyebrows is the lack of robust safeguards. Sesame operates on an honor system, simply encouraging users and developers to avoid using the model to replicate someone's voice without permission, produce misleading content like fake news, or partake in any "harmful" or "malicious" activities. I personally tested the demo on Hugging Face, and within a minute, I had cloned my voice. It was a breeze to generate speech on any topic, even sensitive ones like the election and Russian propaganda.
Consumer Reports recently highlighted the concerning lack of "meaningful" safeguards in many AI-powered voice cloning tools, which could lead to potential fraud or abuse. Sesame, co-founded by Oculus co-creator Brendan Iribe, caught the public's eye in late February with its assistant tech that nearly escapes the uncanny valley. Both Maya and Sesame's other assistant, Miles, exhibit realistic human-like traits such as taking breaths, speaking with disfluencies, and being interruptible mid-speech, similar to OpenAI's Voice Mode.
Financially, Sesame has secured undisclosed funding from heavyweights like Andreessen Horowitz, Spark Capital, and Matrix Partners. Beyond voice assistants, the company is also venturing into prototyping AI glasses intended for all-day wear, equipped with their custom models. This move shows Sesame's ambition to push the boundaries of AI technology further into our daily lives.
Stripe to Acquire OpenRouter as AI Model Routing Gains Momentum
Stripe has agreed to acquire OpenRouter, an AI model-routing platform that gives developers access to hundreds of models through a single interface. The deal adds model selection and routing to Stripe’s existing work around AI usage and token-based b
Google AI Overviews Gain Ground in Search Results
According to Similarweb’s 2026 Generative AI Landscape report, Google’s AI-generated summaries appeared in 43% of US searches, a significant rise from 15% recorded a year prior.While AI Overviews present generated summaries within standard search res
Sequoia-backed Empirik raises $21M to forecast outages before they strike
Before joining Sequoia Capital in 2020 as chief digital and information officer, Avon Puri spent over a decade running infrastructure at Rubrik and VMware. Three years ago, as large language models began showing their true potential, Puri, alongside
2026 Latest Top-rated AI Illustration Tools: Our curated list features the best powerfully designed tools for creating stunning editorial scenes and eye-catching cover art quickly. Each option has gone through rigorous real-world tests, offering a free vs paid comparison to help you find the perfect match for your workflow. Try these must-try solutions today to unlock your AI edge and boost your creative productivity. Explore now at XIX.AI.
10 tools
xix.ai
2026 Latest Top-Rated Best AI Tutors for Exam Prep are here on XIX.AI! Our curated list features powerful game-changing tools that offer free vs paid comparison, real-world tests, and weekly updated rankings. They help boost your writing efficiency, simplify complex topic learning, and unlock your academic potential. Explore now to Discover your perfect exam prep tool and Start creating today to Unlock your AI edge!
10 tools
xix.ai
2026 Latest Best Top-Rated AI Budget Planning Tools for Personal Money Management are here on XIX.AI! This curated collection features powerful, game-changing solutions that help you conduct real-world tests, understand spending habits, and create personalized plans to boost productivity. Enjoy a free vs paid comparison along with detailed rankings. Must-try tools designed to simplify money management and unlock your AI edge. Explore now!
11 tools
xix.ai
2026 Latest Best Top-Rated AI Sleep Tracking Assistants curated for ultimate recovery. This fully updated weekly guide features powerful tools that deliver real-world tests, free vs paid comparison, and detailed rankings to help you find the must-try solution that boosts sleep quality and supports better bedtime habits. Explore now at XIX.AI to Unlock your AI edge.
10 tools
xix.ai
2026 Latest Best Top-Rated AI SQL Copilots for Product and Revenue Analytics! XIX.AI has curated a powerful, game-changing collection of must-try tools that undergo real-world tests through weekly updated rankings. These tools help users boost productivity significantly by accelerating data analysis, streamlining complex queries, and generating accurate insights to drive smarter business decisions. Explore now to Discover your perfect tool for unlocking your AI edge!
14 tools
xix.ai
2026 Latest Best Top-Rated AI Homework Helpers That Teach Core Concepts Not Just Answers Powerful Tools for Students Must-Try Curated List Weekly Updated Free vs Paid Comparison Real-World Tests Accurate Rankings to Help You Unlock Your Full Learning Potential Explore now to Discover your perfect tool for smarter studying.
10 tools
xix.ai
C'est incroyable ce que Sesame a fait avec Maya ! Un modèle à 1 milliard de paramètres, ça doit être une sacrée bête. Mais franchement, ça donne quoi en termes d'éthique ? On va tous finir avec des assistants trop parfaits ? 😅
Wow, Sesame's CSM-1B sounds like a game-changer! A billion parameters for Maya’s lifelike voice? That’s some serious tech flex. Curious how it stacks up against other models in real-world use. 😎
Whoa, a 1B parameter model powering Maya? That's some serious brainpower! Curious how Sesame's CSM-1B stacks up against other AI giants. Excited to see where this tech takes us! 🚀
Sesame's base AI model for Maya is mind-blowing! 1 billion parameters? That's insane! Maya's voice is so lifelike, it's like talking to a real person. But sometimes she gets a bit too chatty, which can be annoying. Still, a fantastic piece of tech! 🤯
¡El modelo base de IA de Sesame para Maya es alucinante! ¿1 billón de parámetros? ¡Eso es una locura! La voz de Maya es tan realista, parece que estoy hablando con una persona real. Pero a veces se pone un poco parlanchina, lo que puede ser molesto. Aún así, una tecnología fantástica! 🤯
Das Basis-AI-Modell von Sesame für Maya ist umwerfend! 1 Milliarde Parameter? Das ist verrückt! Mayas Stimme ist so lebensecht, es fühlt sich an, als würde man mit einer echten Person sprechen. Aber manchmal wird sie ein bisschen zu gesprächig, was nervig sein kann. Trotzdem, eine fantastische Technologie! 🤯
