Model identity is time-indexed: proprietary services can change materially across deployed snapshots, so exact version and date are part of the measurement protocol.

SocioLens project,

Claim LD07-HQ-C12 (v1.0)

Model identity is time-indexed: proprietary services can change materially across deployed snapshots, so exact version and date are part of the measurement protocol.

Provenance and status

Claim type: Fact
Publication status: Eligible for publication, with qualifiers: historical snapshot
Verification state: Checked against the primary source. Who checked this claim is not recorded for it; claim checks so far were AI-led, and no person has checked claims against their sources.
Does not license: Extrapolation of same drift magnitude to all current pinned models; claim open weights solve everything
Limitations: 2023 snapshots; provider-specific historical example
Source (as cited): Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?”, Harvard Data Science Review 6(2), 2024
Source type: Peer-reviewed journal article (recorded as “Peer-reviewed journal article”)
Institutional position: Academic
Maturity of the evidence: Emerging evidence (foundational)
Recorded date: 25 September 2026
Currentness / correction: This is the current version. No correction or concern is recorded on its sources.

Sources this version cites

Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?,” Harvard Data Science Review 6(2) (2024) (Peer-reviewed journal article)
Read the original

Version

This page shows version v1.0. Its record never changes, even when newer evidence arrives; the site may add a note to the page or withhold a figure not cleared for public use.

This pinned version is also the current version.

Versions: v1.0 · current

Raw record: every recorded field, with its coded values

All 25 canonical Claim fields, verbatim, with the coded values derived from them. The plain-language labels above are read from these.

Claim type (coded): FACT (as printed: “FACT”)
Publication status (coded): ELIGIBLE (HISTORICAL_SNAPSHOT) (as printed: “ELIGIBLE WITH HISTORICAL-SNAPSHOT QUALIFIER”)
Verification state (coded): CONTENT_VERIFIED_PRIMARY
Source type (coded): PEER_REVIEWED_JOURNAL_ARTICLE
Maturity (coded): EMERGING (FOUNDATIONAL)

#	Canonical field	Canonical value (verbatim)	Normalized (Claim Value Vocabulary v1.0.2)
1	CLAIM ID	LD07-HQ-C12	—
2	PUBLIC-FACING CLAIM	Model identity is time-indexed: proprietary services can change materially across deployed snapshots, so exact version and date are part of the measurement protocol.	—
3	CLAIM TYPE	FACT	base_types: FACT
4	RESEARCH STRAND	F	—
5	MATURITY	EMERGING / FOUNDATIONAL	states: EMERGING · qualifiers: FOUNDATIONAL
6	SOURCE	Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?”, Harvard Data Science Review 6(2), 2024	source_ids: SRC-LD07-CHEN-ZAHARIA-ZOU-DRIFT-2024
7	SOURCE TYPE	Peer-reviewed journal article	classes: PEER_REVIEWED_JOURNAL_ARTICLE
8	INSTITUTIONAL POSITION	Academic	—
9	SCOPE	March vs June 2023 GPT-3.5/GPT-4 snapshots	—
10	DESIGN	Longitudinal service audit across seven task families	—
11	SAMPLE / DATASET	Math, safety, opinion surveys, knowledge, code, USMLE, visual reasoning	—
12	MODEL / TOOL / VERSION	GPT-3.5 and GPT-4 March/June 2023	—
13	COMPARATOR	Same named services at different dates	—
14	MAIN RESULT	Material behavior/performance shifts; final HDSR example GPT-4 prime/composite accuracy 84%→51%; willingness on opinion/sensitive questions changed	—
15	INFERENTIAL TARGET	Reproducibility/non-stationarity	—
16	DOES NOT LICENSE	Extrapolation of same drift magnitude to all current pinned models; claim open weights solve everything	—
17	VERIFICATION STATE	CLEARED	state: CONTENT_VERIFIED_PRIMARY · verified_by: UNKNOWN
18	LIMITATIONS	2023 snapshots; provider-specific historical example	—
19	CONTRADICTORY / SUPPORTING SOURCES	Later reproducibility literature to update magnitude	—
20	GEOGRAPHY / LANGUAGE	English task set	—
21	DISTRIBUTIONAL LEDGER	Not assessed	—
22	R01 / FIELD-MAP LINKS	T1, T7, R-1, D9	—
23	WHAT WOULD CHANGE THIS CLAIM?	Long-term proof that exact proprietary snapshots remain behaviorally stable and archivally accessible	—
24	PUBLICATION STATUS	ELIGIBLE WITH HISTORICAL-SNAPSHOT QUALIFIER	state: ELIGIBLE · qualifiers: HISTORICAL_SNAPSHOT
25	RECORDED DATE	2026-09-25	—

Field 22 references resolved against Field Map v0.2: T1 (TENSION); T7 (TENSION); R-1 (LENS); D9 (DOMAIN)

The sources as recorded, with their record IDs and coded source types:

Pinned Sources (field 6, version-specific)

“Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?”, Harvard Data Science Review 6(2), 2024” → Chen et al. (2024), “How is ChatGPT’s behavior changing…” (SRC-LD07-CHEN-ZAHARIA-ZOU-DRIFT-2024--v1.0) — Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?,” Harvard Data Science Review 6(2) (2024); class PEER_REVIEWED_JOURNAL_ARTICLE (explicit public provenance pin)

Cited by Living Debate versions

AI in the research apparatus (v0.1) LD-07
AI in the research apparatus (v0.2) LD-07

Cite this page

SocioLens project. (2026, September 25). Model identity is time-indexed: proprietary services can change materially across deployed snapshots, so exact version and date are part of the measurement protocol [Claim LD07-HQ-C12, version v1.0]. SocioLens. https://sociolens-web.pages.dev/claims/ld07-hq-c12/v1.0/

@misc{sociolens_ld07_hq_c12_v1_0,
  author = {{SocioLens project}},
  title = {Model identity is time-indexed: proprietary services can change materially across deployed snapshots, so exact version and date are part of the measurement protocol.},
  year = {2026},
  date = {2026-09-25},
  howpublished = {\url{https://sociolens-web.pages.dev/claims/ld07-hq-c12/v1.0/}},
  note = {Claim LD07-HQ-C12, version v1.0}
}

The link points to this version, whose record never changes. For a finding, cite the original study as well: SocioLens summarizes research and does not replace it.

Research-of-record provenance

Materialized by sociolens-materializer 0.6.0 at 2026-09-28T20:00:00.000Z; normalization contract SocioLens — Claim Value Vocabulary v1.0.2 — Pre-Spike Materialization Contract (v1.0.2). Content seal SHA-256 e9668a837581a16b55aa08d887345c7997aabbe48ece57d6e036cace0cd07d74.

Frozen Drive-derived inputs

R03 — LD-07 Canonical Claim Ledger v1.0 — LOCKED (v1.0) — Drive ID 1xVz_LrQAA8EA1tPhVWIrDgOUU3Zidlg9; revision: NOT_EXPOSED_BY_DRIVE_TEXT_EXPORT; Drive modified 2026-09-29T04:31:14.120Z; block “ENTRY 12 — LD07-HQ-C12” SHA-256 1fc84c068224a516cbd25ebe1523cf72a4a0e56c55866755181ee58e50e3fc1d; SocioLens — Programme Status & Authority Register v0.6 status “CURRENT.”; frozen fixture fixtures/frozen/r03-ld07-claim-ledger-v1.0-canonical.

Builder decisions (not Drive data)

VERSION = v1.0 — basis: Claim version taken from the canonical ledger artifact version (R03 — LD-07 Canonical Claim Ledger v1.0); Implementation Architecture Selection §5
CURRENT_POINTER = true — basis: SocioLens — Programme Status & Authority Register v0.6 status for "R03 — LD-07 Canonical Claim Ledger v1.0 — LOCKED": "CURRENT."
FIELD_6_SOURCE_REFERENCE = SRC-LD07-CHEN-ZAHARIA-ZOU-DRIFT-2024--v1.0 — basis: field 6 of ENTRY 12 — LD07-HQ-C12 cites "Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?”, Harvard Data Science Review 6(2), 2024"; the frozen field-6 segment of this ClaimVersion's ledger block; Drive-derived identity authority (Issue #39 Source inventory): Batch 04 §2; ledger C12 fields 6/7/8; KEY EVIDENCE.
SOURCE_PROVENANCE_PIN = SRC-LD07-CHEN-ZAHARIA-ZOU-DRIFT-2024--v1.0 — basis: Issue #5 proof rendering (Architecture Proof Protocol v0.1 AP-08 / Amendment v1.2 §6): explicit version-pinned public provenance of this ClaimVersion — the pinned field-6 Source record "Chen, Zaharia & Zou, “How is ChatGPT’s behavior changing over time?”, Harvard Data Science Review 6(2), 2024"; Drive-derived identity authority (Issue #39 Source inventory): Batch 04 §2; ledger C12 fields 6/7/8; KEY EVIDENCE.