Sentence Transformers

Sentence, Text and Image Embeddings using BERT and other Transformer models

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Open-source Python library for generating sentence, text, and image embeddings with transformer models.

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releasePRIMARY2026-05-12

Sentence Transformers 5.5.0 adds train-sentence-transformers skill with one-shot 0.8856 NDCG@10

Sentence Transformers 5.5.0 adds an agent skill for fine-tuning embeddings, rerankers, and sparse encoders from Claude Code, Codex, Cursor, and Gemini CLI. The author reports a one-shot German embedding run rising from 0.6720 to 0.8856 NDCG@10 on a local PC.