KaLM R2 Reranker Open-Sourced, Retains 92% Recall at 128x Compression

The KaLM-Embedding team released KaLM-Reranker-V1-Nano-R2 on Hugging Face under Apache 2.0, retaining 92% nDCG@10 at 128x compression. Sentence Transformers maintainer tomaarsen also shared guidance on using the R2 reranker series with adjustable compression.

2026-10-30 ~ 2026-10-30 · 2 related posts

• KaLM releases R2 reranker on HF: 92% nDCG@10 retained even at 128x compression — tomaarsen · 2026-10-30
• Sentence Transformers adds tunable compression: R2 rerankers keep 92% nDCG@10 at 128x — tomaarsen · 2026-10-30