A Chinese AI lab opened its search engine to developers. Each result carries a page-level authority tier, and DeepSeek says it filters GEO manipulation.

DeepSeek opened its in-house search engine to developers on Oct. 17, and the company’s changelog says the engine filters SEO spam, “GEO manipulation,” and low-quality AI-generated content.

Each result from the new Search API includes an authority tier for the page and a relevance score, and the API accepts site: queries that limit results to one domain.

DeepSeek’s changelog says its in-house engine handles search on its website and in its API, indexes hundreds of billions of web pages, and takes in hundreds of millions of search requests a day from around the world.

GEO (generative engine optimization) is when you shape your content to be cited by AI answer engines. DeepSeek’s changelog states that they credit strict detection as the source of filtering; however, it has not defined what GEO manipulation is or described how their detection process operates. On May 15, Google said “our spam policies also apply to generative AI responses in Google Search.”

Each Search API result contains an authority field; authority fields range from 0 to 4 with -1 being unknown. According to DeepSeek’s API reference, pages with tiers of 3+ are described as “highly authoritative” sources.

The rerank score (another field) is a scale of 0-3 and incorporates signals that include relevance, authority and freshness. 5+ is considered high quality. The guide and the reference do not explain how a page receives its tier or score.

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