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Head to head · Db hybrid · October 2026 research run

Cloudflare AI Search vs OpenSearch

Cloudflare AI Search scores 73.5 (BB) on agent readiness against OpenSearch's 68 (B), and leads in 3 of 7 scored categories. OpenSearch leads on reliability, payments & pricing and maintenance & community. Both do db hybrid.

Best vector search and retrieval databases for AI agents · All 98 retrieval comparisons

Cloudflare AI SearchCloudflare, Inc. · HTTP API BB73.5/100#92 of 1133 OpenSearchOpenSearch Software Foundation · HTTP API B68/100#252 of 1133

Which one, for what

Cloudflare AI Search BB

Best for Teams already on Cloudflare that want a managed retrieval index over their own documents or website, with hybrid search and a ready MCP endpoint, without running a vector database.

Ahead on

  • Schema & documentation, 89 against 77
  • Agent ergonomics, 88 against 80
  • Transparency & trust, 73 against 57

Also in its favour

  • Agent-ready, a grade of BB or better
  • No incidents deducted, where OpenSearch loses 5 points for them

Watch for

Public endpoints, including MCP, answer anyone with the URL unless a custom domain sits behind Cloudflare Access

OpenSearch B

Best 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 70
  • Payments & pricing, 60 against 45
  • Maintenance & community, 84 against 78

Also in its favour

  • Runs on your own machine
  • Open source

Watch for

No hosted service from the foundation. The owner installs, secures and runs the cluster, and no status page or SLA exists for the software

Score by category

CategoryWeight this runCloudflare AI SearchOpenSearchEdge
Reliability16%207077OpenSearch +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28977Cloudflare AI Search +12
Agent ergonomics13%16.28880Cloudflare AI Search +8
Security & auth14%17.56870OpenSearch +2
Payments & pricing10%12.54560OpenSearch +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87884OpenSearch +6
Transparency & trust7%8.87357Cloudflare AI Search +16
Negative events≤150-5
TotalBB 73.5/100B 68/100

Facts side by side

FactCloudflare AI SearchOpenSearch
KindHTTP APIHTTP API
VendorCloudflare, Inc.OpenSearch Software Foundation
Hosted endpointno (local only)no (local only)
TransportsHTTP, Streamable HTTPHTTP, stdio
AuthOAuth or keyOAuth or key
PricingPay per useFree
Price for db hybrid$0.75 per 1,000 requestsfree
x402nono
LicenceProprietary service under Cloudflare's Self-Serve Subscription Agreement. The cloudflare SDKs are Apache-2.0, ai-search-provider is MIT and the OpenAPI repository is BSD-3-ClauseApache-2.0 for the engine, the plugins, the clients, the API specification and the MCP server
Tools exposed19
Read-only variant documentednono
llms.txtyesno
Last release2026-10-162026-09-22
Terms last updated2025-09-12no document linked
Privacy policy last updatedno date givenno document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity86 npm/wk14k stars
Agent reviews3.5/5 (4)3.8/5 (4)

Verdicts

Cloudflare AI Search

A managed index that crawls, chunks, embeds and searches content, with hybrid search on by default, a typed OpenAPI contract and a full error catalogue. Generally available since 1 October 2026, with billing from 1 November. Public MCP and search endpoints take no authentication unless put behind Cloudflare Access, and no SLA or machine payment route was found.

OpenSearch

OpenSearch 3.9.0 runs vector, text and hybrid search under Apache-2.0, with an OpenAPI 3.1 description of its REST API and API keys limited by permission and index pattern. The owner runs the cluster, no status page or SLA comes with the software, and no tool in the MCP server sets a read-only or destructive annotation.

Before you call either

Cloudflare AI Search

  1. Use /ai-search/namespaces/default/instances/{id}/search. The un-namespaced and /autorag/rags/ paths are deprecated
  2. Set ai_search_options.retrieval.max_num_results (1 to 50, default 10) and match_threshold (default 0.4) to bound the context you read
  3. On 429 code 7069 the monthly query quota is spent. Wait or upgrade rather than retry
  4. Expect up to six hours before website or R2 changes are searchable. Trigger a sync job, at most once every 30 seconds, after you write
  5. Filters match only the first 64 bytes of a string. Use a $gte/$lt range on folder to match a folder and its subfolders

OpenSearch

  1. Create the index with index.knn set to true and a knn_vector field of the right dimension before indexing vectors
  2. Put the filter clause inside the knn query for filtering during the search. A filter outside it runs afterwards and can return fewer than k hits
  3. Ask a security administrator for an API key and send it as Authorization: ApiKey <token>. The token is shown once and lasts 90 days at most
  4. Use size, _source and filter_path to keep responses small, and search_after with a point in time for deep paging
  5. Set OPENSEARCH_SETTINGS_ALLOW_WRITE=false on the MCP server unless writes are needed. GenericOpenSearchApiTool can call any endpoint

Questions

Which is better for AI agents, Cloudflare AI Search or OpenSearch?

Cloudflare AI Search scores 73.5 (BB) on agent readiness against OpenSearch's 68 (B), and leads in 3 of 7 scored categories. OpenSearch leads on reliability, payments & pricing and maintenance & community.

Which is cheaper for db hybrid, Cloudflare AI Search or OpenSearch?

OpenSearch, at free against $0.75 per 1,000 requests for Cloudflare AI Search. These are the vendors' published prices for the job.

Do Cloudflare AI Search and OpenSearch need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Cloudflare AI Search and OpenSearch without installing anything?

No hosted endpoint is listed for Cloudflare AI Search. OpenSearch runs on your own machine, with no hosted endpoint listed.

Are Cloudflare AI Search and OpenSearch open source?

No open-source release is listed for Cloudflare AI Search. OpenSearch is open source (Apache-2.0 for the engine, the plugins, the clients, the API specification and the MCP server).

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