{
  "note": "Founding cohorts. founded_year is a year only. ChatGPT launched on 2022-11-30, eleven months into 2022, so 2022 counts as before and the class is companies founded in 2023 or later.",
  "years": [2010, 2026],
  "theme_years": [2016, 2026],
  "groups": {
    "before": {"from": 2019, "to": 2022, "label": "Founded 2019 to 2022"},
    "class": {"from": 2023, "to": 2025, "label": "Founded 2023 to 2025"},
    "partial": {"from": 2026, "to": 2026, "label": "Founded in 2026 so far"}
  },
  "all_companies_note": "Every company on the Platform founded in the year, with no AI filter, as the base of the AI share. A total of 100,000 or more comes back banded, so a banded count is split into disjoint parts and added: first by size band (the nine closed values and no size), then a banded band by headcount (0, 1, 2, 3 to 4, 5 to 10, 11 or more, none), then by headquarters country (United States, any other, none). wave.json keeps the parts' sum and the number of parts.",
  "size_bands": ["Myself Only", "1-10", "11-50", "51-200", "201-500", "501-1000", "1001-5000", "5001-10,000", "10,001+"],
  "headcount_parts": [[0, 0], [1, 1], [2, 2], [3, 4], [5, 10], [11, null]],
  "lag": {
    "note": "Two direct signals that the newest years are incomplete. First, how recently the records were refreshed: counts of AI companies per founding year by updated_at month. Second, how many carry a headcount at all, and one of 11 or more, since a company page gains staff after it is created. Both are counted for AI companies (below the band, no split needed).",
    "updated_buckets": [
      {"id": "before-2026-04", "lte": "2026-03-31"},
      {"id": "2026-04", "gte": "2026-04-01", "lte": "2026-04-30"},
      {"id": "2026-05", "gte": "2026-05-01", "lte": "2026-05-31"},
      {"id": "after-2026-05", "gte": "2026-06-01"}
    ]
  }
}