4B Zen reranker, quantized to GGUF (Q4_K_M) for CPU and mixed CPU/GPU re-scoring with llama.cpp.

Repackaged from Qwen/Qwen3-Reranker-4B (apache-2.0, Alibaba Qwen), quantized to GGUF. Not trained from scratch — a permissively-licensed redistribution for the OSS-clean Zen model line.

Use with llama.cpp reranking support (llama-server --reranking, /v1/rerank). Full-precision safetensors: zenlm/zen-reranker-4B.

apache-2.0. Upstream: Qwen/Qwen3-Reranker-4B by Alibaba Qwen. This repository redistributes a quantized derivative under the same license.