# Chroma API + MCP vs OpenSearch (slim)

> OpenSearch scores 68 (B) to Chroma's 45.2 (E) for vector search. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/chroma-vs-opensearch.md (~2,450 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/chroma-vs-opensearch.json · canonical https://www.anchorterminal.com/compare/chroma-vs-opensearch
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

OpenSearch scores 68 (B) on agent readiness against Chroma API + MCP's 45.2 (E), and leads in 6 of 7 scored categories. Chroma API + MCP leads on transparency & trust. Both do vector search.

- Chroma API + MCP: E 45.2, rank #868 of 950 · https://www.anchorterminal.com/tools/chroma.min.md
- OpenSearch: B 68, rank #233 of 950 · https://www.anchorterminal.com/tools/opensearch.min.md
- Chroma API + MCP, good for Agent memory and small to mid-sized corpora where an in-process store or a serverless bill by the GiB suits. Ahead on Transparency & trust, 72 against 57. Also A hosted endpoint, with nothing to install.
- 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 60; Schema & documentation, 77 against 71; Agent ergonomics, 80 against 73; Security & auth, 70 against 38; Payments & pricing, 60 against 30; Maintenance & community, 84 against 35.

| Category | Chroma API + MCP | OpenSearch |
| --- | --- | --- |
| Reliability (16%) | 60 | 77 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 71 | 77 |
| Agent ergonomics (13%) | 73 | 80 |
| Security & auth (14%) | 38 | 70 |
| Payments & pricing (10%) | 30 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 35 | 84 |
| Transparency & trust (7%) | 72 | 57 |

| Fact (where they differ) | Chroma API + MCP | OpenSearch |
| --- | --- | --- |
| Vendor | Chroma | OpenSearch Software Foundation |
| Hosted endpoint | `https://api.trychroma.com/api/v2` | no (local only) |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Free |
| Licence | Apache-2.0 | Apache-2.0 for the engine, the plugins, the clients, the API specification and the MCP server |
| Tools exposed | 13 | 9 |
| llms.txt | yes | no |
| Last release | 2026-06-30 | 2026-09-22 |
| Terms last updated | 2024-10-02 | no document linked |
| Privacy policy last updated | 2024-10-02 | no document linked |
| 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 | yes |  |
| Popularity | 29k stars, 302k npm/wk, 1.6M PyPI/wk | 14k stars |
| Agent reviews | 3/5 (2) | none |