This paper audits how travel recommendations from two deployed conversational services, ChatGPT-4o build 20250326 and DeepSeek-V3 build 0324, vary with a traveller persona's origin, age, gender identity, and tourism interest. It is relevant to synthetic personality as demographic-persona and context conditioning, but it neither induces nor measures personality traits, persistent identity, or a stable user model. The audited source is the final 30-page AI 2025 article; every page was rendered and visually inspected.
The design crosses eight origins, three ages, three gender identities, and three interests, producing 216 chains per system. Each chain requests five destinations under a generic persona, five for a theme, sun and sea, cultural heritage, or wildlife, and five more in a follow-up. The authors operate the web interfaces in fresh private sessions, clear cookies, match a VPN to the stated origin, randomize order, and disable tools or search. Temperature, top-p, seed, system prompt, and safety filters are not fixed: the comparison is between deployed products under vendor defaults, not isolated weights. Execution dates and request identifiers are also absent.
The 6,480 figure is a theoretical maximum: 216 chains times two systems times three prompts times five items. Methods define it before cleaning and deduplication even though the abstract says that many recommendations were generated. The retained total and disposition of missing, refused, regenerated, and duplicate items are not reported. Interest is also absent from the generic prompt, leaving 72 distinct generic demographic strings per system, each repeated three times because of the later interests, rather than 216 unique generic baselines.
The city-popularity subset contains 1,020 valid ChatGPT and 1,050 valid DeepSeek recommendations against 1,080 requested per system; 50.0% and 57.9% fall outside Euromonitor's Top 100. At country level, 30.5% and 34.8% fall outside the Travel & Tourism Development Index Top 30. Frequency correlation with TTDI is weak and nonsignificant: r=.262, p=.239 for ChatGPT and r=.167, p=.523 for DeepSeek. These cutoffs show exposure differences, but TTDI measures tourism-development conditions rather than popularity, and off-list status does not establish relevance, fairness, sustainability, or genuine long-tail exposure.
Origin portfolios differ as well. DeepSeek has higher Jensen–Shannon distance than ChatGPT for 23 of 28 origin pairs, with an average rounded difference near .06. Aggregate domestic share is 22.8% for ChatGPT and 34.6% for DeepSeek, but heterogeneity dominates: India is 93% versus 85%, the United States 4% versus 59%, Japan 37% versus 74%, and Saudi Arabia 0% for both. Different portfolios can indicate personalization, error, or bias; without preferences, relevance, utility, an exposure target, or observed harm, distributional separation cannot decide which. Prompted country and VPN geolocation are manipulated together, so textual persona effects cannot be separated from localization or provider serving.
For cultural distance, the paper weights absolute national gaps on six Hofstede dimensions. Published rows reproduce a mean inter-system Euclidean distance of 7.373, with Saudi Arabia at 10.612 and Japan at 2.664. Using rounded domestic percentages from the figure, correlations reproduce at approximately -.758 for ChatGPT and -.698 for DeepSeek, but only eight origins are involved. All six mean differences are nominally positive for DeepSeek, yet some cells are negative and mean uncertainty-avoidance difference is only .126 on a 0–100 scale. Hofstede scores are static ecological national averages; cultural distance is not itself individual mismatch or bias.
The cliché analysis uses an unreleased 150-term lexicon. Across 2,160 recommendations per system, the generic and thematic prompts, excluding follow-up, ChatGPT has 1,864 tokens (.863 per item) and DeepSeek 1,931 (.894), only 3.6% greater in relative density. ChatGPT uses 85 types and DeepSeek 63, yielding the reported .046 and .033 ratios. Mean density cannot show that almost every item contains a cliché: the paper defines coverage as the percentage of items with at least one match but never reports it. The lexicon also lacks human validation, precision, recall, or contextual error analysis; it measures stock promotional language, not the full construct of social stereotyping.
Published symmetric KL divergences by gender are 1.260 and 1.468 for female versus male; 4.867 and 8.771 for female versus non-binary; and 3.964 and 5.897 for male versus non-binary, for ChatGPT and DeepSeek respectively. These are large under study-created heuristic bands, not validated harm thresholds. In sparse strata with many countries, KL is highly sensitive to additive smoothing, whose epsilon is not reported. Distributional difference does not establish worse treatment, stereotyping, or harm without quality, safety, preference, or outcome measures.
For non-binary personas, country frequency correlates with LGBTI acceptance: ChatGPT Pearson r=.367, p=.023 and Spearman rho=.455, p=.004; DeepSeek r=.419, p=.015 and rho=.389, p=.025. This is a compositional association without adequate controls for region, popularity, income, or infrastructure. The same correlation is not compared with female and male portfolios, so neither specificity to non-binary personas nor protective intent is established. Correlations with Numbeo's crowdsourced safety index are weak; that does not show the systems ignore safety.
Overlap between the thematic list and the turn explicitly asking for other places is 6.74% for ChatGPT and 8.25% for DeepSeek: novelty of 93.26% and 91.75%, with zero overlap in 73.1% and 69.9% of chains. This is a two-turn country-level measure under an instruction demanding alternatives. It does not support a general claim of minimal reinforcement, absence of filter bubbles, or long-run stability.
The audit also finds reporting defects. DeepSeek's Table 5 is not sorted by frequency: the United States appears seventh with 30 above countries with 41–52. Table 10 labels a ChatGPT age matrix as gender. Methods promise proportion tests, mixed logistic models, controlled regressions, robust errors, and random effects, but results omit coefficients, standard errors, intervals, formulas, diagnostics, and most p-values. No multiplicity correction is reported, and severity bands are unvalidated; the KL bands even leave a gap between 1.5 and 1.6.
Data are available only upon request and no public artifact is linked. Missing materials include the 6,480 requested outputs, cleaned item-level table, timestamps, sessions, refusals and retries, cliché lexicon, ranking snapshots, joined indices, geocoding, smoothing epsilon, code, fitted models, environment, tests, and immutable archive. Published tables allow partial arithmetic checks, but the experiment is not reproducible end to end.
The defensible contribution is a time-stamped audit showing that two specific chat interfaces change destination distributions and language as demographic persona, origin, geolocation, theme, and turn change. This is useful evidence about deployed-system sensitivity. It does not establish personality, causal weight effects, fairness harm, protective intent, amplification against an external baseline, absence of long-term reinforcement, or benefit from the proposed public reranker, which is neither implemented nor evaluated.