# Changelog

## 2026-09-10 · Baseline (first publication)

- 525 measurements, 35 prompts, ChatGPT, Perplexity, Gemini, 5 runs.
- Counting: one provider counts once per answer. Earlier internal figures (2,595 mentions) counted
  repeated mentions within one answer; this dataset counts 2,548.
- 10 spelling variants of provider names merged; names of individual persons removed.
- Sources: only rows belonging to the 525 valid measurements (discarded and replaced versions excluded).
- 35 measurements marked 'not recorded' for sources (limitation DP-1).
- "Own website as source in the same answer" (about 49 %): share of provider mentions, in answers with
  captured sources, where the normalised provider name appears in the domain stem of a source cited in
  the same answer (or vice versa, at least 4 characters). An approximation.