# OpenSearch vs Weaviate API + MCP (slim)

> OpenSearch and Weaviate score within a point of each other for vector search, 68 and 67.9 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/opensearch-vs-weaviate.md (~2,550 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/opensearch-vs-weaviate.json · canonical https://www.anchorterminal.com/compare/opensearch-vs-weaviate
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

OpenSearch and Weaviate API + MCP score within a point of each other on agent readiness, 68 (B) and 67.9 (B). Weaviate API + MCP leads on schema & documentation, agent ergonomics, security & auth, maintenance & community and transparency & trust. Both do vector search.

- OpenSearch: B 68, rank #233 of 950 · https://www.anchorterminal.com/tools/opensearch.min.md
- Weaviate API + MCP: B 67.9, rank #235 of 950 · https://www.anchorterminal.com/tools/weaviate.min.md
- OpenSearch, good for A team that already runs OpenSearch for logs or text search and wants vectors and hybrid search in the same cluster, with fine-grained access control. Ahead on Reliability, 77 against 35; Payments & pricing, 60 against 40. Also Runs on your own machine.
- Weaviate API + MCP, good for Hybrid keyword and vector retrieval with filters and multi-tenancy, self-hosted or managed, and for agents that work over MCP. Ahead on Schema & documentation, 82 against 77; Agent ergonomics, 92 against 80; Security & auth, 79 against 70; Maintenance & community, 90 against 84; Transparency & trust, 68 against 57. Also Free to start without a card; No incidents deducted, where OpenSearch loses 5 points for them.

| Category | OpenSearch | Weaviate API + MCP |
| --- | --- | --- |
| Reliability (16%) | 77 | 35 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 82 |
| Agent ergonomics (13%) | 80 | 92 |
| Security & auth (14%) | 70 | 79 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 84 | 90 |
| Transparency & trust (7%) | 57 | 68 |

| Fact (where they differ) | OpenSearch | Weaviate API + MCP |
| --- | --- | --- |
| Vendor | OpenSearch Software Foundation | Weaviate |
| Transports | HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Pricing | Free | Freemium |
| Licence | Apache-2.0 for the engine, the plugins, the clients, the API specification and the MCP server | BSD-3-Clause (some parts under the Weaviate License) |
| Tools exposed | 9 | 4 |
| Read-only variant documented | no | yes |
| llms.txt | no | yes |
| Last release | 2026-09-22 | 2026-10-01 |
| Terms last updated | no document linked | 2026-05-01 |
| Privacy policy last updated | no document linked | 2024-02-01 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 14k stars | 17k stars, 406k npm/wk, 2.3M PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |