Project AURIONAI Use-Cases Research & Innovation
speech synthesis

CSM-1B

Sesame's open conversational speech model; Sesame also runs voice agents in iOS/Android apps.

Sesame AI Inc.Sesame AI Inc.
Sesame AI Inc.
Levelmodel
Classspeech synthesis
Parameters1B
Contextnot in the notes
Released13 Mar 2025
Opennessopen weights permissive
Runs onconsumer GPU
Statusactive

R&D Topics

Real-time spoken dialogue and low-latency voice generationexemplar

Identity

Developer
Sesame AI Inc.
Family
not in the notes
Released
13 Mar 2025 sourcesregistry date
Weights published
–
Record checked
10 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.

Architecture and Size

Architecture
dense transformer Llama backbone plus audio decoder emitting Mimi codes
Total parameters
1B sources
Active parameters
–
Checkpoint parameters
–
Note
1B (metadata 2B)
Context length
not in the notes
Input
text
Output
audio
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).

Openness and Access

Openness
open weights permissive
Licence
Apache License 2.0 sources
Access routes
open weights download
Where this comes from
The licence file governs over registry tags and aggregator labels.

Deployment

Runs on
consumer GPU
Footprint
not in the notes
Runtimes
not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.

Indonesia

Indonesian support
not stated
Regional languages
not in the notes
Jakarta hosting
unknown
Languages
English; weak non-English
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.

Benchmark Results

The notes record no benchmark result for this model.

Lineage

The notes record no lineage for this model.

Industry Use Cases

No industry use case links this model.

Sources

  1. Sesame sesame.com https://www.sesame.com/
  2. huggingface.co/sesame/csm-1b https://huggingface.co/sesame/csm-1b
  3. sesame.com/about https://www.sesame.com/about

To cite this page: Project AURION, AI Use-Cases Research & Innovation, "CSM-1B", https://aurion.semai.id/models/sesame-csm-1b/, records of October 2026.