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AI tool

Perplexity

An AI-powered answer engine oriented around web research and links to supporting sources.

Editorially reviewedVerified 2026-08-112 official or primary sources

What it is

Perplexity describes its core product as an AI-powered search or answer engine that returns conversational answers with citations to original sources.

Citations improve inspectability but do not prove that every sentence is supported. A useful pilot checks whether the cited page exists, is authoritative, and actually entails the adjacent claim.

Worth evaluating for

  • Early-stage web research with visible source links
  • Question answering where reviewers need a source trail
  • Research workflows that already include primary-source verification

What to measure

  • Citation entailment, not just citation presence
  • Coverage of primary and opposing sources
  • Reproducibility when the web results change

Decision cautions

  • Search results and source availability change over time.
  • A citation may be real without supporting the exact generated claim.
  • Sensitive research inputs require a separate policy and account review.

Sources checked

Open the original pages before relying on a time-sensitive product decision.

  1. What is Perplexity?Perplexity
  2. Perplexity product platformsPerplexity
Version · v4.3.4-indexnow-root-proof

Latest releases

IndexNow root-proof request compatibility

After v4.3.3, the exact root-level {key}.txt proof returned HTTP 200, but a full request carrying keyLocation still returned HTTP 403; a minimal homepage request with the same production key and no keyLocation returned HTTP 202. This release omits that field, while the automatic full run and idempotent rerun remain deployment checks.

IndexNow key-proof compatibility

Changed IndexNow verification to the official root-level {key}.txt convention after the first production notification returned HTTP 403; revalidation remains pending, while the website, sitemaps, and Bing sitemap processing are unaffected.

Bing sitemap discovery and IndexNow change notifications

Prepared canonical sitemap discovery for Bing and added automatic IndexNow change notifications while keeping segmented sitemaps authoritative and making no claim that a notified URL has been crawled or indexed.

View all releases