{
  "study_id": "TSA-REC-001",
  "wave": "1",
  "published_date": "2026-09-25",
  "execution": "API models through Vercel AI Gateway with native search/grounding",
  "observations": 72,
  "model_families": 4,
  "prompts": 6,
  "repeats_per_prompt_model": 3,
  "overall": {
    "cross_model_recommendation_overlap_jaccard": 0.06648424893966286,
    "repeat_run_recommendation_stability_jaccard": 0.3361955875484641,
    "repeat_run_citation_domain_stability_jaccard": 0.5546237306008978,
    "unique_citation_domains": 108
  },
  "system_summary": {
    "openai": {
      "model": "openai/gpt-5.6-sol",
      "repeat_entity_stability": 0.21014425795127548,
      "repeat_citation_stability": 0.3234126984126984,
      "cross_prompt_entity_overlap": 0.13787856050246727
    },
    "anthropic": {
      "model": "anthropic/claude-sonnet-4.6",
      "repeat_entity_stability": 0.5087728345403784,
      "repeat_citation_stability": 0.8052878408141567,
      "cross_prompt_entity_overlap": 0.2249070995588642
    },
    "gemini": {
      "model": "google/gemini-3.1-pro-preview",
      "repeat_entity_stability": 0.09477268016354705,
      "repeat_citation_stability": 0.11593817402640931,
      "cross_prompt_entity_overlap": 0.16125776584382892
    },
    "perplexity": {
      "model": "perplexity/sonar-pro",
      "repeat_entity_stability": 0.531092577538656,
      "repeat_citation_stability": 0.9738562091503268,
      "cross_prompt_entity_overlap": 0.2781010282299823
    }
  },
  "top_citation_domains": [
    [
      "homelight.com",
      43
    ],
    [
      "fastexpert.com",
      42
    ],
    [
      "zillow.com",
      40
    ],
    [
      "listwithclever.com",
      36
    ],
    [
      "effectiveagents.com",
      36
    ],
    [
      "expertise.com",
      36
    ],
    [
      "realtrends.com",
      32
    ],
    [
      "homes.com",
      28
    ],
    [
      "yelp.com",
      27
    ],
    [
      "realtor.com",
      23
    ]
  ],
  "source_class_mix": {
    "portal_or_directory": 417,
    "first_party": 149,
    "news_or_editorial": 106,
    "government_or_regulatory": 13,
    "social": 10,
    "other": 17
  },
  "caveat": "Wave 1 used API models rather than the consumer applications described in Protocol v1.0, and the separate evidence follow-up was not run as a second turn. See execution-addendum."
}