{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/sesame-csm-1b/","md":"https://postcutoff.com/m/sesame-csm-1b/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"sesame-csm-1b","name":"Sesame CSM-1B (Conversational Speech Model)","org":"Sesame","family":"CSM","released":"2025-03-13","status":"current","type":"audio/speech","modality_in":["text","audio"],"modality_out":["audio"],"open_weights":true,"model_license":"apache-2.0","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":null,"price_line":"Price not published","access":[{"provider":"Hugging Face","model_id":"sesame/csm-1b","url":"https://huggingface.co/sesame/csm-1b"},{"provider":"Transformers","model_id":"sesame/csm-1b","docs":"https://huggingface.co/docs/transformers/model_doc/csm"},{"provider":"Sesame app (Maya, Miles, Simone, Charlie — hosted larger models)","url":"https://www.sesame.com/"}],"capabilities":[{"name":"Context-conditioned conversational TTS","detail":"Llama backbone + audio decoder emitting Mimi audio codes; generates speech conditioned on prior conversation audio/text so prosody fits the dialogue; voice prompting via context segments.","first":false,"discovered":"launch","source":"https://huggingface.co/sesame/csm-1b"}],"entry":"2026-05-28-sesame-ios-app","notes":"Open base generation model only (no fine-tuned voices, English-centric, cannot generate text itself); the Maya/Miles demo voices use Sesame's larger in-house models. Native in Transformers since v4.52.1. Sesame raised a $250M Series B (Oct 2025, Sequoia/Spark) and launched a public-preview iOS app with four agents (Maya, Miles, Simone, Charlie) in 39 countries on 2026-05-28; smart glasses targeted for 2027. No newer open Sesame model found as of 2026-09-29.","verified":"2026-09-29","body_md":"Sources: https://huggingface.co/sesame/csm-1b , https://techcrunch.com/2026/05/28/sesame-the-conversational-ai-startup-from-oculus-founders-launches-its-ios-app/","page_url":"https://postcutoff.com/m/sesame-csm-1b/","standing":{"kind":"speech and audio","newer_count":100,"newer":[{"id":"nemotron-3-5-transcribe","name":"NVIDIA Nemotron 3.5 Transcribe (30B-A4B)","org":"NVIDIA","released":"2026-10-28","page_url":"https://postcutoff.com/m/nemotron-3-5-transcribe/"},{"id":"hy-simulmt-30b-a3b","name":"Hy-SimulMT-30B-A3B","org":"Tencent","released":"2026-10-22","page_url":"https://postcutoff.com/m/hy-simulmt-30b-a3b/"},{"id":"eleven-realtime-v1-max","name":"Eleven Realtime v1 Max / Mini","org":"ElevenLabs","released":"2026-10-20","page_url":"https://postcutoff.com/m/eleven-realtime-v1-max/"},{"id":"voxtral-mini-transcribe-3","name":"Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-mini-transcribe-3/"},{"id":"voxtral-small-transcribe-3","name":"Voxtral Small Transcribe 3","org":"Mistral AI","released":"2026-10-20","page_url":"https://postcutoff.com/m/voxtral-small-transcribe-3/"}],"before":null,"after":null,"weights":"public","licence":"apache-2.0","licence_permissive":true,"summary":"Weights are public under a permissive licence (Apache-2.0)."}}