Azure AI Search vs OpenSearch
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
OpenSearch is the stronger AI pick in Vector Databases: it has a visibility score of 3.9 versus 1.2 for Azure AI Search, and ranks ahead in 0% of the answers that name both.
Choose Azure AI Search if…
- AI answers describe it more positively (67% vs 0% positive)
- You need ISO 27001 or ISO 27018 or ISO 27701 or SOC 2 or FedRAMP or HIPAA or GDPR coverage
- Strong analyst recognition as a vector database vendor
Choose OpenSearch if…
- You want the brand AI engines rank higher (3.9 vs 1.2)
- Strong general database popularity
- Hybrid keyword-plus-semantic search with dense vectors
- Suited to broader search, logging, analytics, and observability
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Azure AI Search | OpenSearch |
|---|---|---|
| Visibility score | 1.2% | 3.9% |
| Change vs last week | New | New |
| Rank in Vector Databases | #23 | #16 |
| Share of voice | 0.6% | 1.7% |
| Mentions this run | 3 | 8 |
| Positive in AI answers | 67% | 0% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Azure AI Search 0pp · OpenSearch 0pp over 0 weekly runs.
Engine by engine
OpenSearch leads on 3 of 3 engines
Head to head in AI answers
1 engine answers name both brands
| Prompt | Engine | Azure AI Search | OpenSearch |
|---|---|---|---|
| Which Vector Databases vendors do analysts recommend? | ChatGPT | #6 | #8 |
Features, pricing & fit
| Dimension | Azure AI Search | OpenSearch |
|---|---|---|
| Deployment | Cloud service on Microsoft Azure with Dedicated tiers and a Serverless consumption-based pricing model in preview | Self-managed, or through Amazon OpenSearch Service and managed providers such as Aiven and Instaclustr. A Kubernetes operator is available for managing clusters. |
| Compliance | ISO 27001, ISO 27018, ISO 27701, SOC 2, FedRAMP, HIPAA, GDPR | — |
| Support | — | Community forum, Slack, GitHub, Long-term support from certified providers |
| Founded | — | 2021 |
| Headquarters | — | San Francisco, CA, United States |
| Employees | — | 51–200 |
| Best for | — | Organizations that want search, vector retrieval, and observability on open source software without vendor lock-in. |
Pros and cons
Themes from the AI answers that mention each brand
Azure AI Search
- Strong analyst recognition as a vector database vendor
OpenSearch
- Strong general database popularity
- Hybrid keyword-plus-semantic search with dense vectors
- Suited to broader search, logging, analytics, and observability
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Azure AI Search vs OpenSearch”, https://slateindex.ai/compare/azure-ai-search-vs-opensearch, data of Nov 2, 2026. Licence: CC BY 4.0.