From an 80-word answer box to a computer-driving agent: 20 Perplexity prompts chart the leak era; Exa shows one official demo, Parallel and You.com show nothing

The search produced 21 qualifying prompt/source rows across 15 independent hosts: 20 for Perplexity and 1 for Exa, spanning December 2022 to 2026, with one row per URL so no single source backs more than half the evidence. No qualifying leaked or internal prompt was found for Parallel Web Systems or You.com in the searched sources — that is "not found in this search," not proof none exists.

Date caveat: dates are mixed by source. Where a source gives only an embedded current date or a prompt-file date, the plotted date reflects prompt vintage, not an independently verified first disclosure. 13 of 21 rows carry a usable date; undated corroborating rows appear in the feature cards and the table.

Timeline: Perplexity's prompt evolution, December 2022 – 2026

Leaked / extracted / community-collected prompt Officially public prompt material Hover or tap a point for the full detail; undated corroborating sources are in the cards below

What the timeline cannot say

Side by side: the four companies asked about

Perplexity, feature by feature

All 21 source rows

Company	Feature	Prompt date	Published	Provenance	Source

Show all rows

Method: 21 prompt/source rows (one per company × prompt/feature × independent source host after semantic deduplication) across 15 independent hosts — 20 Perplexity, 1 Exa, 0 Parallel, 0 You.com. Each row records prompt or disclosure date where available, provenance, assigned role, workflow, output rules, guardrails, and source URL; one row per URL. Dates may reflect prompt vintage rather than verified first disclosure when the source embeds only a current or file date. Earlier apparent Exa/Parallel/You.com hits were third-party skills or wrappers and were excluded. Long rule texts are truncated in cards and table for space; full detail sits at the linked sources.