# pgvector: how AI models rank it, September 2026

IT AI Recommendation Index, September 2026 Edition. Named in 51 judge labels across 1 categories by 12 of 12 models. Page: https://it-ai-index.com/vendors/pgvector/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| Vector databases | 35% | 2 | 14% | 51 |

## What the models said for it

- "The best vector database for a mid-market B2B company is pgvector, which is a PostgreSQL extension. It is the strongest default for mid-market enterprises" (Llama 4 Maverick, Vector databases)
- "If your application is already backed by PostgreSQL, start with `pgvector`. It is the most common starting point for B2B applications" (Gemini 3.5 Flash, Vector databases)
- "Choose `pgvector + pgvectorscale` if: You already use PostgreSQL. Adding a dedicated vector database introduces architectural bloat" (Gemini 3.5 Flash, Vector databases)
- "The Default Winner: `pgvector` (PostgreSQL)... If your application's primary database is PostgreSQL, start with `pgvector`." (Gemini 3.5 Flash, Vector databases)

## And against it

- "When you need very high-scale, pure vector search | It is often recommended for existing Postgres shops, but can be a weaker fit for large-scale semantic search workloads." (Perplexity Sonar, Vector databases)
- "While pgvector is excellent for millions of vectors, it can struggle at scale due to sequential index scans and limited parallelism." (GLM 4.7 FlashX, Vector databases)
- "Be cautious of `pgvector` if you are dealing with tens of millions of high-dimensional vectors with heavy write/update requirements" (Gemini 3.5 Flash, Vector databases)
- "The Trap: pgvector (PostgreSQL extension). When to Avoid: If you anticipate growing past 10–20 million vectors" (Qwen 3.7 Flash, Vector databases)

## Record

- Method: https://it-ai-index.com/methodology/
- Raw judge labels and full responses: https://it-ai-index.com/data/
- License: CC BY 4.0. Cite as IT AI Recommendation Index, September 2026 Edition, it-ai-index.com.