Reranking Models

PRX-Memory supports multiple reranking providers through the prx-memory-rerank crate. Each provider implements the same adapter trait, allowing seamless switching.

Jina AI

Jina offers cross-encoder reranking models with multilingual support.

PRX_RERANK_PROVIDER=jina
PRX_RERANK_API_KEY=your_jina_key
PRX_RERANK_MODEL=jina-reranker-v2-base-multilingual

Model	Notes
jina-reranker-v2-base-multilingual	Multilingual cross-encoder
jina-reranker-v1-base-en	English-optimized

INFO

Jina reranking can use the same API key as Jina embedding. Set JINA_API_KEY once to cover both.

Cohere

Cohere provides high-quality reranking through their Rerank API.

PRX_RERANK_PROVIDER=cohere
PRX_RERANK_API_KEY=your_cohere_key
PRX_RERANK_MODEL=rerank-v3.5

Model	Notes
rerank-v3.5	Latest model, best quality
rerank-english-v3.0	English-optimized
rerank-multilingual-v3.0	Multilingual support

Pinecone

Pinecone offers reranking as part of their inference API.

PRX_RERANK_PROVIDER=pinecone
PRX_RERANK_API_KEY=your_pinecone_key
PRX_RERANK_MODEL=bge-reranker-v2-m3

For custom Pinecone-compatible endpoints:

PRX_RERANK_PROVIDER=pinecone-compatible
PRX_RERANK_API_KEY=your_key
PRX_RERANK_ENDPOINT=https://your-endpoint.example.com
PRX_RERANK_API_VERSION=2025-01

Choosing a Reranker

Priority	Recommended Provider	Model
Best quality	Cohere	rerank-v3.5
Multilingual	Jina	jina-reranker-v2-base-multilingual
Integrated with Pinecone	Pinecone	bge-reranker-v2-m3
No reranking needed	--	PRX_RERANK_PROVIDER=none

Combining Embedding and Reranking

A common high-quality configuration pairs Jina embeddings with Cohere reranking:

# Embedding
PRX_EMBED_PROVIDER=jina
PRX_EMBED_API_KEY=your_jina_key
PRX_EMBED_MODEL=jina-embeddings-v3

# Reranking
PRX_RERANK_PROVIDER=cohere
PRX_RERANK_API_KEY=your_cohere_key
PRX_RERANK_MODEL=rerank-v3.5

This setup leverages Jina's fast multilingual embeddings for broad retrieval and Cohere's high-precision reranker for final ordering.

Next Steps

• Embedding Models -- First-stage embedding model options
• Configuration Reference -- All environment variables