S
2025 Review

Sesame AI (CSM) Review

Honest review of Sesame AI (CSM)'s voice AI and TTS capabilities

4.4
Based on features, quality, and value

Quick Verdict

Conversational Speech Model for emotionally intelligent, human-like AI speech.

Sesame AI (CSM) Review Summary

Sesame AI's Conversational Speech Model (CSM) is a breakthrough in emotional, conversational AI speech. Unlike traditional TTS, CSM generates speech that sounds truly human, with natural pauses, emotional nuances, and conversational flow that makes AI interactions feel authentic.

What We Like About Sesame AI (CSM)

Most natural conversational AI
Emotional intelligence
Open-source model available
Novel approach to TTS
Great for AI companions

What Could Be Better

Very new technology
Limited voices currently
Higher compute requirements

Who Is Sesame AI (CSM) Best For?

Sesame AI (CSM) is particularly well-suited for:

AI Assistants
Customer Service
Healthcare
Companion Apps

Key Features Review

1
Conversational speech
2
Emotional intelligence
3
Natural pauses
4
Context awareness
5
Open-source base model
6
Human-like flow

Sesame AI (CSM) FAQs

What is the Conversational Speech Model?

CSM is Sesame AI's approach to speech synthesis that generates contextually aware, emotionally intelligent speech that sounds like natural human conversation.

Is Sesame AI open source?

Yes, Sesame AI has released their CSM-1B model as open source, with larger enterprise models available commercially.

How is CSM different from regular TTS?

CSM considers context, emotion, and conversational flow, producing speech with natural hesitations, emphasis, and emotional tone that traditional TTS lacks.

The Bottom Line

With a rating of 4.4/5, Sesame AI (CSM) stands out as a strong choice in the voice AI space. The free tier makes it easy to get started. Best for AI Assistants and Customer Service.