Sentence Transformers

Reimers & Gurevych's library for training sentence embeddings — substrate under most open-weight embedding models. Now under Hugging Face.

Active · Verified 2026-10-26 · fresh as of 2026-10-26 · 19 cited facts, 1 with a third-party source · 1 recorded change · Suggest a correction

At a glance

Type: Open embedding training framework vendor fix
Tier: T1
Section: Embedding & reranker services
Created: 2019 repo fix
Latest release: searched not found fix
License: Apache-2.0 vendor fix
GitHub: huggingface/sentence-transformers — ~19.2k stars, active (commit date not captured) repo fix
Pricing: free (OSS) repo fix
Funding: searched not found fix
Freshness: 2026-10-26 fix
Layer: model-infra repo fix
Licensing: open-source vendor fix
Deployment locus: local repo fix
Platform vs product: platform repo fix
Maturity: ga registry fix
SDK languages: python registry fix
Developer activity: OpenRank 9.65 (12-mo avg 19.23) — 2025-09 third-party fix

Optimised for: searched not found

Anti-fit: searched not found

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SBERT paper has 5000+ citations.

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2026-10-26
- Pricing first recorded as “free (OSS)” source
- Deployment first recorded as “Self-hosted only — Python library (pip)” source
#258

Chroma integrates with — Chroma's docs have a Sentence Transformers integration page. (verified 2026-10-29)
Haystack (framework) integrates with — Haystack integrations directory has a Sentence Transformers integration page ("Use Sentence Transformers embedding and ranking models in your Haystack pipelines"). (verified 2026-10-29)
LanceDB integrates with — LanceDB's docs have a Sentence Transformers integration page. (verified 2026-10-29)
LangChain (framework) integrates with — LangChain docs have a Sentence Transformers embeddings integration page. (verified 2026-10-29)
Mem0 integrates with — Mem0 docs have a Sentence Transformer reranker page. (verified 2026-10-29)
Milvus integrates with — Milvus's integrations overview lists a Milvus + Sentence Transformers integration tutorial. (verified 2026-10-29)
NVIDIA NeMo Guardrails integrates with — NeMo Guardrails docs have a Sentence Transformers embeddings provider page. (verified 2026-10-29)
Phidata (now Agno) integrates with — Agno ships a sentence_transformer embedder (agno.knowledge.embedder.sentence_transformer). (verified 2026-10-29)
Pydantic-AI integrates with — Pydantic AI embeddings docs list Sentence Transformers as an embeddings provider. (verified 2026-10-29)