Sesame CSM-1B
Sesame CSM-1B is an open-source conversational speech model that delivers ultra-realistic, contextually aware text-to-speech with lifelike emotional intelligence, natural pauses, and low-latency generation under 400ms. Build immersive voice agents effortlessly with its efficient Llama-based architecture, running locally on modest hardware.
Optimized for clear, natural speech synthesis.
Get Started
Text to Speech
Turn written words into audio.
Paste your script, select a preset voice, and generate high-quality spoken audio instantly.
Browse Voice Library
Find the perfect sound.
Listen to samples of all available voices to find the right tone for your project before you generate.
Why use Sesame CSM-1B?
Generates Contextually Appropriate Speech
Produces natural, coherent speech by leveraging conversation history, including emotional intelligence, timing, pauses, and tone.
Low-Latency Audio Generation
Generates audio in 200-400 milliseconds, enabling real-time conversational interactions.
Multimodal Input Processing
Handles interleaved text and audio inputs simultaneously for enhanced contextual understanding and speaker consistency.
Try These with Sesame CSM-1B
"Hey, how's it going? Pretty good, thanks! I'm just chilling here, thinking about grabbing some coffee later. What about you?"
Highlights natural dialogue flow with casual greetings and filler words for realism.
"Once upon a time, in a misty forest deep and green, a curious fox named Finn discovered a hidden glowing cave. With a hesitant paw, he stepped inside, heart pounding with wonder and a touch of fear. What secrets lay within?"
Emphasizes narrative pacing, vivid descriptions, and emotional tone shifts.
"Um, yeah, so I was walking down the street earlier, and this dog just comes up to me, wagging its tail like crazy. I mean, it was adorable, right? Had to pet it for a bit before moving on."
Demonstrates voice adaptation using contextual utterances with natural hesitations and enthusiasm.
"User: What's the weather like today? Assistant: Oh, it's partly cloudy with a chance of rain later, you know, about 60%. User: Should I bring an umbrella? Assistant: Definitely, better safe than sorry—those showers can sneak up fast!"
Showcases conversational continuity, maintaining consistent speaking style across turns.
Sample scripts — click any card to copy
How to generate
Go to Tool
Navigate to the "Text to Speech" page.
Select Model
Choose Sesame CSM-1B and pick a Voice.
Enter Text
Type or paste your script to be spoken.
Generate
Click generate and download your MP3 instantly.
Compare Voice Models
Unsure which voice sounds best? Test Sesame CSM-1B against others in our Speech Playground.
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