Claim LD07-HQ-C05 (v1.0)

LLM simulations can usefully forecast the relative pattern of treatment effects in some US survey-experiment archives, while systematically overstating effect magnitudes.

Provenance and status

Claim type: FACT (as printed: “FACT”)
Publication status: ELIGIBLE (ESTIMAND) (as printed: “ELIGIBLE WITH ESTIMAND QUALIFIER”)
Verification state: CONTENT_VERIFIED_PRIMARY (SOURCE_SPECIFIC) (as printed: “CLEARED WITH QUALIFIER”; verified by: UNKNOWN)
Does not license: Synthetic population substitution; unbiased effect sizes; mechanism recovery; subgroup validity; non-US transport
Source (field 6, as printed): Ashokkumar, Hewitt, Ghezae & Willer, Nature 656:115–122 (2026), doi:10.1038/s41586-026-10742-x
Source type (field 7): PEER_REVIEWED_JOURNAL_ARTICLE (as printed: “Peer-reviewed journal article”)
Institutional position: Independent academic; one author also industry-affiliated
Maturity (claim evidence / publication maturity): CONTESTED (POSITIVE_BOUNDED_USE) (as printed: “CONTESTED / POSITIVE BOUNDED USE”)
Recorded date: 2026-09-25
Currentness / correction: This is the current version. No correction or concern relation is recorded on its Sources.

Version

Pinned version v1.0 (entry LD07-HQ-C05--v1.0) — this page never floats to newer evidence.

This pinned version is also the current version.

Versions:v1.0 · current

Pinned Sources (field 6, version-specific)

“Ashokkumar, Hewitt, Ghezae & Willer, Nature 656:115–122 (2026), doi:10.1038/s41586-026-10742-x” → SRC-LD07-ASHOKKUMAR-NATURE-2026--v1.0 — Ashokkumar, Hewitt, Ghezae & Willer, “Large language models can predict the results of social science experiments,” Nature 656:115–122 (2026); class PEER_REVIEWED_JOURNAL_ARTICLE (explicit public provenance pin)

Read the originals

SRC-LD07-ASHOKKUMAR-NATURE-2026: open the original

All 25 canonical Claim fields (raw values and normalized values)

#	Canonical field	Canonical value (verbatim)	Normalized (Claim Value Vocabulary v1.0.2)
1	CLAIM ID	LD07-HQ-C05	—
2	PUBLIC-FACING CLAIM	LLM simulations can usefully forecast the relative pattern of treatment effects in some US survey-experiment archives, while systematically overstating effect magnitudes.	—
3	CLAIM TYPE	FACT	base_types: FACT
4	RESEARCH STRAND	C — Synthetic respondents/agents	—
5	MATURITY	CONTESTED / POSITIVE BOUNDED USE	states: CONTESTED · qualifiers: POSITIVE_BOUNDED_USE
6	SOURCE	Ashokkumar, Hewitt, Ghezae & Willer, Nature 656:115–122 (2026), doi:10.1038/s41586-026-10742-x	source_ids: SRC-LD07-ASHOKKUMAR-NATURE-2026
7	SOURCE TYPE	Peer-reviewed journal article	classes: PEER_REVIEWED_JOURNAL_ARTICLE
8	INSTITUTIONAL POSITION	Independent academic; one author also industry-affiliated	—
9	SCOPE	US nationally representative text-based survey experiments	—
10	DESIGN	Forecast/model simulation benchmark against realized experimental effects and human forecasts	—
11	SAMPLE / DATASET	70 experiments; 469 effects; 119,330 participants; 15 secondary megastudies/606 effects	—
12	MODEL / TOOL / VERSION	GPT-4 primary plus prominent open-weight models	—
13	COMPARATOR	Realized human treatment effects; pooled human/expert forecasts	—
14	MAIN RESULT	Strong effect-pattern correlation / human-forecast-comparable accuracy; systematic magnitude overestimation	—
15	INFERENTIAL TARGET	Aggregate effect forecasting / replication triage	—
16	DOES NOT LICENSE	Synthetic population substitution; unbiased effect sizes; mechanism recovery; subgroup validity; non-US transport	—
17	VERIFICATION STATE	CLEARED WITH QUALIFIER	state: CONTENT_VERIFIED_PRIMARY · qualifiers: SOURCE_SPECIFIC · verified_by: UNKNOWN
18	LIMITATIONS	US survey-experiment archive; exact public r=.85 attribution to VOR remains HOLD	—
19	CONTRADICTORY / SUPPORTING SOURCES	Li & Ji shows realism ≠ ATE estimation; Cui/Li/Zhou shows null→significant inflation	—
20	GEOGRAPHY / LANGUAGE	US / English	—
21	DISTRIBUTIONAL LEDGER	Subgroup performance unresolved	—
22	R01 / FIELD-MAP LINKS	D9, R-1, T1	—
23	WHAT WOULD CHANGE THIS CLAIM?	Failure on independent non-US experimental archives	—
24	PUBLICATION STATUS	ELIGIBLE WITH ESTIMAND QUALIFIER	state: ELIGIBLE · qualifiers: ESTIMAND
25	RECORDED DATE	2026-09-25	—

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

Cited by Living Debate versions

LD-07 v0.1

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 5e1c81162b8ef25d5bed6a5db6d84d8c41dee1ed576f8c4e5ba1c563cab9bf63.

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 05 — LD07-HQ-C05” SHA-256 1bde3e034b0890c118453eca52b1332ac22679f04989cf11b3a217a52a4a8f8c; 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_17_CONTEXT_QUALIFIERS = SOURCE_SPECIFIC — basis: R03 — HQ Cross-Batch Synthesis & Adjudication (v0.1, Drive 1V-HOVaPFwF8BTf60-LGPsJXf59V3kRlQ)
FIELD_6_SOURCE_REFERENCE = SRC-LD07-ASHOKKUMAR-NATURE-2026--v1.0 — basis: field 6 of ENTRY 05 — LD07-HQ-C05 cites "Ashokkumar, Hewitt, Ghezae & Willer, Nature 656:115–122 (2026), doi:10.1038/s41586-026-10742-x"; the frozen field-6 segment of this ClaimVersion's ledger block; Drive-derived identity authority (Issue #39 Source inventory): Batch 02 §1; ledger C05 fields 6/7/8; KEY EVIDENCE.
SOURCE_PROVENANCE_PIN = SRC-LD07-ASHOKKUMAR-NATURE-2026--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 "Ashokkumar, Hewitt, Ghezae & Willer, Nature 656:115–122 (2026), doi:10.1038/s41586-026-10742-x"; Drive-derived identity authority (Issue #39 Source inventory): Batch 02 §1; ledger C05 fields 6/7/8; KEY EVIDENCE.