# Perplexity change log

> What changed in Perplexity, by date: every Paralax brief about it, each linking its source where one exists.

- Canonical: https://paralax.ai/engines/perplexity
- Latest brief: 2026-09-22
- Change log index: https://paralax.ai/engines

## Dated briefs

### 2026-09-22 — [Perplexity Citation Change Log: 490 of the Top 500 Domains, Recorded Six Sources Deep](https://paralax.ai/blog/perplexity-citation-change-log-2026)

A dated record of what Perplexity cites. Entry one: Perplexity reaches 490 of the 500 most-cited domains, the widest head overlap of any engine measured.

- Markdown: https://paralax.ai/blog/perplexity-citation-change-log-2026.md

### 2026-08-11 — [Perplexity's Time Markdown-Ad Block Turns AI Search Trust Into a Publisher Ranking Factor](https://paralax.ai/blog/perplexity-time-markdown-ads-ai-search-trust-score)

Perplexity's Time ad block shows AI search trust is becoming source governance.

- Primary source: [docs.perplexity.ai](https://docs.perplexity.ai/docs/agent-api/building-agents/prompt-the-agent)
- Markdown: https://paralax.ai/blog/perplexity-time-markdown-ads-ai-search-trust-score.md

### 2026-07-19 — [Perplexity WANDR Benchmark: Research Agents Still Fail Evidence Depth](https://paralax.ai/blog/perplexity-wandr-research-agents-search-depth-2026)

Perplexity WANDR shows AI research agents still fail at evidence depth, not just page discovery.

- Primary source: [research.perplexity.ai](https://research.perplexity.ai/articles/wandr-benchmark-evaluating-research-agents-that-must-search-wide-and-deep)
- Markdown: https://paralax.ai/blog/perplexity-wandr-research-agents-search-depth-2026.md

### 2026-07-18 — [Germany Treats AI Search as Media Infrastructure](https://paralax.ai/blog/germany-ai-search-media-law-google-perplexity-2026)

Germany's ZAK ruling reframes AI search answers as accountable media surfaces.

- Markdown: https://paralax.ai/blog/germany-ai-search-media-law-google-perplexity-2026.md

### 2026-06-15 — [Perplexity's Answer Engine Is Now 20 Models, Not One — And It Changes How You Get Cited](https://paralax.ai/blog/perplexity-deep-research-multi-model-routing-citation)

Perplexity now routes Deep Research across 20+ models. Your citation is no longer one model's call — it's an orchestration outcome.

- Markdown: https://paralax.ai/blog/perplexity-deep-research-multi-model-routing-citation.md

### 2026-06-03 — [Perplexity Search as Code Turns Retrieval Into Agent Infrastructure](https://paralax.ai/blog/perplexity-search-as-code-agent-retrieval)

Perplexity Search as Code shifts AI search from ranked results to executable retrieval workflows.

- Primary source: [research.perplexity.ai](https://research.perplexity.ai/articles/rethinking-search-as-code-generation)
- Markdown: https://paralax.ai/blog/perplexity-search-as-code-agent-retrieval.md

### 2026-05-29 — [CNN's Perplexity Lawsuit Makes AI Search Attribution a Product Risk](https://paralax.ai/blog/cnn-perplexity-lawsuit-ai-search-attribution-risk)

CNN's Perplexity suit shows attribution is becoming an AI search product requirement, not a publisher courtesy.

- Markdown: https://paralax.ai/blog/cnn-perplexity-lawsuit-ai-search-attribution-risk.md

## Baseline measurements

Measured citation behavior for this engine, recorded release by release: [Perplexity Citation Change Log: 490 of the Top 500 Domains, Recorded Six Sources Deep](https://paralax.ai/blog/perplexity-citation-change-log-2026)