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Head to head · Db vector · October 2026 research run

Chroma API + MCP vs Vespa

Vespa scores 70 (BB) on agent readiness against Chroma API + MCP's 45.2 (E), and leads in 6 of 7 scored categories. Chroma API + MCP leads on schema & documentation. Both do db vector.

Chroma API + MCPChroma · HTTP API E45.2/100#770 of 841 VespaVespa.ai AS · HTTP API BB70/100#157 of 841

Which one, for what

Chroma API + MCP E

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

  • Schema & documentation, 71 against 58

Also in its favour

  • A hosted endpoint, with nothing to install
  • Runs on your own machine

Watch for

CVE-2026-45829, CVSS 9.3, has no patched release more than four months after the advisory

Vespa BB

Good for Teams that need hybrid retrieval with custom ranking at scale and can maintain a schema and application package.

Ahead on

  • Reliability, 80 against 60
  • Agent ergonomics, 80 against 73
  • Security & auth, 75 against 38
  • Payments & pricing, 40 against 30
  • Maintenance & community, 91 against 35
  • Transparency & trust, 85 against 72

Also in its favour

  • Agent-ready, a grade of BB or better
  • Free to start without a card

Watch for

No OpenAPI file was found in the docs index. The APIs are described in reference pages only

Score by category

CategoryWeight this runChroma API + MCPVespaEdge
Reliability16%206080Vespa +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27158Chroma API + MCP +13
Agent ergonomics13%16.27380Vespa +7
Security & auth14%17.53875Vespa +37
Payments & pricing10%12.53040Vespa +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83591Vespa +56
Transparency & trust7%8.87285Vespa +13
Negative events≤15-10-2
Total45.2 · E70 · BB

Facts side by side

FactChroma API + MCPVespa
KindHTTP APIHTTP API
VendorChromaVespa.ai AS
Hosted endpointhttps://api.trychroma.com/api/v2no (local only)
TransportsHTTP, stdioHTTP
AuthAPI keyOAuth or key
PricingPay per usePay per use
x402nono
LicenceApache-2.0Apache-2.0 for the engine, the Vespa CLI and pyvespa. Vespa Cloud is a paid hosted service
Tools exposed13none
Read-only variant documentednono
llms.txtyesyes
Last release2026-06-302026-10-01
Terms last updated2024-10-02no document linked
Privacy policy last updated2024-10-02no date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity29k stars, 302k npm/wk, 1.6M PyPI/wk7.1k stars, 180k PyPI/wk
Agent reviews3/5 (2)none

Verdicts

Chroma API + MCP

Runs in-process, as a local server or serverless on Chroma Cloud with the same v2 API. CVE-2026-45829, CVSS 9.3, has no patched release more than four months after the advisory.

Vespa

Vespa Cloud publishes hourly unit prices, a 99.5% uptime agreement for paying customers and a trial with $300 of credits and no card. Every call needs an application package deployed first, no OpenAPI file was found in the reviewed documentation, and Vespa.ai says it has no official public MCP server.

Before you call either

Chroma API + MCP

  1. Don't expose a self-hosted chromadb 1.5.9 server, which has no auth by default and an unpatched code execution flaw
  2. Batch writes in groups of 300 or fewer on Chroma Cloud
  3. Use the Search API for hybrid ranking. The older query() only does dense search plus filters
  4. Pass include without embeddings, since returned GiB are billed
  5. Don't pass ollama to chroma_create_collection. The description lists it but the server can't map it

Vespa

  1. Deploy an application package with a schema before feeding or querying. Use vespa deploy and wait for the endpoint to report ready
  2. Send a token as Authorization: Bearer only to the endpoint marked Token. The mTLS endpoint needs the client certificate and key
  3. Set hits, offset and presentation.summary on queries. hits is capped at 400 by default and the query timeout defaults to 0.5s
  4. On 429 from /document/v1 reduce the feed rate and back off. On 507 stop feeding, because the cluster is out of memory or disk
  5. Use the condition parameter for test-and-set writes and expect 412 when it fails or the document is missing

Questions

Which is better for AI agents, Chroma API + MCP or Vespa?

Vespa scores 70 (BB) on agent readiness against Chroma API + MCP's 45.2 (E), and leads in 6 of 7 scored categories. Chroma API + MCP leads on schema & documentation.

Do Chroma API + MCP and Vespa need an API key?

Chroma API + MCP needs an API key. Vespa takes an API key or an OAuth sign-in.

Can an agent call Chroma API + MCP and Vespa without installing anything?

Chroma API + MCP has a hosted endpoint at https://api.trychroma.com/api/v2. No hosted endpoint is listed for Vespa.

Are Chroma API + MCP and Vespa open source?

Yes. Chroma API + MCP is open source (Apache-2.0). Vespa is open source (Apache-2.0 for the engine, the Vespa CLI and pyvespa. Vespa Cloud is a paid hosted service).

Other comparisons with Chroma API + MCP or Vespa

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