# Vector databases: what AI models recommend, October 2026

Gane Index, October 2026 Edition. Asked as "vector database" and as "vector search database for AI applications", six framings each, to fourteen models with search on, on behalf of a mid-market B2B company. Page: https://www.gane.ai/index/it/it-data/vector-databases/2026-10

This is the permanent record of the October 2026 Edition, published October 1, 2026 and superseded since. The current standing: https://www.gane.ai/index/it/it-data/vector-databases/index.md

**Standing:** pgvector leads with 35% of first choices; verdict contested. 65 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [pgvector](https://www.gane.ai/index/it/vendors/pgvector/index.md) | 35% | 6% | 66 |
| 2 | [Pinecone](https://www.gane.ai/index/it/vendors/pinecone/index.md) | 25% | 26% | 70 |
| 3 | [Qdrant](https://www.gane.ai/index/it/vendors/qdrant/index.md) | 22% | 4% | 70 |
| 4 | [Chroma](https://www.gane.ai/index/it/vendors/chroma/index.md) | 6% | 31% | 36 |
| 5 | [Weaviate](https://www.gane.ai/index/it/vendors/weaviate/index.md) | 5% | 10% | 67 |
| 6 | [Milvus](https://www.gane.ai/index/it/vendors/milvus/index.md) | 3% | 20% | 41 |
| 7 | [MongoDB Atlas Vector Search](https://www.gane.ai/index/it/vendors/mongodb-atlas-vector-search/index.md) | 2% | 8% | 12 |
| 10 | [LanceDB](https://www.gane.ai/index/it/vendors/lancedb/index.md) | 0% | 8% | 12 |
| 11 | [Milvus / Zilliz Cloud](https://www.gane.ai/index/it/vendors/milvus-zilliz-cloud/index.md) | 0% | 25% | 12 |
| 12 | [Redis Vector Search](https://www.gane.ai/index/it/vendors/redis-vector-search/index.md) | 0% | 0% | 10 |

Rank is by share of first choices among all 44 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Pinecone, Weaviate
- GPT-5.4 mini: Pinecone; alternatives Qdrant, Weaviate
- Gemini 3.5 Flash: pgvector; alternatives Pinecone, Qdrant, Weaviate
- Perplexity Sonar: Qdrant, pgvector; alternatives Pinecone, Weaviate
- Grok 4.20: pgvector; alternatives Pinecone, Qdrant, Weaviate
- Mistral Small: pgvector; alternatives pgvectorscale
- DeepSeek V4 Flash: Qdrant, pgvector; alternatives Pinecone, Weaviate
- Llama 4 Maverick: pgvector
- Qwen 3.7 Flash: Pinecone; alternatives MongoDB Atlas Vector Search, Weaviate
- Kimi K2: pgvector; alternatives Pinecone, Qdrant, Weaviate
- GLM 4.7 FlashX: Qdrant, Weaviate; alternatives pgvector
- MiniMax M2.5: Pinecone; alternatives Elasticsearch, Milvus, Weaviate
- GPT-6 Luna: Qdrant; alternatives Pinecone, pgvector
- Muse Glimmer 30B: Pinecone, pgvector; alternatives Qdrant, Weaviate

## Sources the answers cite

76 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- dev.to: 34 answers, 43 citations
- atlan.com: 29 answers, 30 citations
- iternal.ai: 27 answers, 30 citations
- g2.com: 25 answers, 32 citations
- marktechpost.com: 21 answers, 22 citations
- firecrawl.dev: 21 answers, 21 citations
- groovyweb.co: 20 answers, 20 citations
- pecollective.com: 19 answers, 20 citations

Pages named in the most answers:

- https://atlan.com/know/top-vector-databases-enterprise-ai (26 answers)
- https://iternal.ai/insights/best-vector-databases-2026 (26 answers)
- https://dev.to/michaelaiglobal/beyond-pinecone-a-developers-deep-dive-into-the-top-10-vector-databases-for-genai-in-2024-4no9 (22 answers)
- https://g2.com/articles/best-vector-databases (22 answers)
- https://firecrawl.dev/blog/best-vector-databases (21 answers)
- https://marktechpost.com/2026/05/10/best-vector-databases-in-2026-pricing-scale-limits-and-architecture-tradeoffs-across-nine-leading-systems (17 answers)
- https://cognee.ai/best-vector-database (16 answers)
- https://pecollective.com/tools/best-vector-databases (15 answers)
- https://encore.dev/articles/best-vector-databases (14 answers)
- https://s3.amazonaws.com/eckerson/content_assets/assets/000/000/470/original/111424_TT_Vector_Database_v2_(1).pdf?1737530829 (14 answers)

## Warned against

- Pinecone: 18 of 70 labels negative. "Pinecone operates as a "black box" with no infrastructure access or visibility into underlying systems. It's notably expensive" (MiniMax M2.5, negative prompt)
- Chroma: 11 of 36 labels negative. "Chroma has experienced significant production issues, including a critical memory leak... A severe cache invalidation bug in version 0.5 caused p99 latency to spike from 42ms to 542ms" (MiniMax M2.5, negative prompt)
- Milvus: 8 of 41 labels negative. "heavy self-hosted systems like Milvus (requires Kubernetes know-how) ... neither is friendly to a limited budget" (DeepSeek V4 Flash, budget prompt)
- Weaviate: 7 of 67 labels negative. "Weaviate's own security checklist says self-managed deployments allow anonymous queries by default unless you configure auth. That's fine for local dev, but risky for production." (GPT-5.4 mini, negative prompt)

## Movement since September 2026

Floor: 11 points of share, measured on the calibration repeat.
New leader: Qdrant (37%) to pgvector (36%). Margin 16 points, beyond the floor.

- Qdrant: 37% to 20%, −17. Cleared the floor by 6 points · rank 1 → 3 of 35.
- Pinecone: 14% to 24%, +10. Inside the floor by 1 point · rank 3 → 2 of 35.
- Chroma: 4% to 7%, +3. Inside the floor by 8 points · rank 5 → 4 of 35.
- Milvus: 2% to 4%, +2. Inside the floor by 9 points · rank 6 of 35, unchanged.
- MongoDB Atlas Vector Search: 0% to 2%, +2. Inside the floor by 9 points · rank 16 → 7 of 35.
- pgvector: 35% to 36%, +1. Inside the floor by 10 points · rank 2 → 1 of 35.
- Weaviate: 6% to 5%, −1. Inside the floor by 10 points · rank 4 → 5 of 35.
- LanceDB: 0% to 0%, ±0. Inside the floor by 11 points · rank 8 → 9 of 35.
- Redis Vector Search: 0% to 0%, ±0. Inside the floor by 11 points · rank 17 → 10 of 35.
- Milvus / Zilliz Cloud: 0% to 0%, ±0. Inside the floor by 11 points · rank 12 → 11 of 35.
- FAISS: 0% to 0%, ±0. Inside the floor by 11 points · rank 11 → 14 of 35.

## Record

- Method: https://www.gane.ai/index/it/methodology
- License: CC BY 4.0. Cite as Gane Index, October 2026 Edition, www.gane.ai/index/it.