Claim · 2025-12-18 · publication · Stated in source · Supported

OpenAI published the GPT-5.2-Codex addendum to its GPT-5.2 system card, dated December 18, 2025 on its cover.

One recorded claim. The claim panel gives its qualification, the source passages with their place in each source, and how it was checked.

What it connects

OpenAI → published → Addendum to GPT-5.2 System Card: GPT-5.2-Codex

Where it appears

No collection page holds this claim. It is listed with its records in the explorer.

Claim and evidence

OpenAIpublished ↓Addendum to GPT-5.2 System Card: GPT-5.2-Codex

Machine-checkedStated in sourceSupported

Supporting evidence: primary · 1 source

Object version: As dated December 18, 2025 on its cover · Published 2025-12-18 · Effective date not established
Date: 2025-12-18 · publication Records dated 2025 →

Scope and limitsPublication is not evidence that the evaluations described were carried out as described.

The evidence 01

primary sourceSupports the claim

Addendum to GPT-5.2 System Card: GPT-5.2-Codex

OpenAI · 2025-12-18

Archived copy, captured 2025-12-19: Addendum to GPT-5.2 System Card: GPT-5.2-Codex

Cite the original source

Cite the original document, not Selekoa. Check these details against it.

Source excerpt

“Addendum to GPT-5.2 System Card: GPT-5.2-Codex OpenAI December 18, 2025”

Location in source Cover, PDF p. 1

How it was read Retrieved directly from the publisher

Machine-checked · 2026-11-03

Source details and check notes

Authors: OpenAI
Version: Retrieved for the candidate pack on 2026-11-02 (SHA-256 5fe918b740727770d0571684fd8c168190172649d2b2e8b7ca4cacad23b3e027) directly from the publisher’s host. Retrieved again on 2026-11-03 with the same SHA-256. The archive capture was found by an index search of the Internet Archive on 2026-11-03; it was not opened, and its bytes are not authenticated.
Canonical address: Open the canonical source ↗
Accessed: 2026-11-02
Language: English (en)
Archive copy: Open archived copy, captured 2025-12-19: Addendum to GPT-5.2 System Card: GPT-5.2-Codex. Captured 1 day after the recorded publication date. An archive copy shows only what the archive retrieved on 2025-12-19. It does not prove what the page said earlier, and it can differ from the copy checked on 2026-11-02.
Attribution: OpenAI, “Addendum to GPT-5.2 System Card: GPT-5.2-Codex”, 2025-12-18.
Reuse: No open redistribution licence asserted. Bibliographic metadata, editorial paraphrases and short attributed quotations (at most 50 words each). Recheck terms before wider redistribution.
Check notes: Candidate pack passage, model cards compared (research/model-cards). The quotation (10 words) matched the card’s text retrieved for the candidate pack on 2026-11-02 (SHA-256 5fe918b740727770d0571684fd8c168190172649d2b2e8b7ca4cacad23b3e027) and again on 2026-11-03 in a fresh retrieval with the same SHA-256. Matching ignored differences of whitespace, case, quotation marks, dashes, PDF line-break hyphens and Unicode compatibility forms, so the source’s typography can differ. No human editorial review.

Status and meaning

Editorial status. Machine-checked. Machines found this record and checked it against its sources; no person accepted it individually. Each evidence record above shows how it was checked.

Relation. Publication of a specific document or version. Publication of a policy is not evidence of implementation.

Date. The date printed on the cover; the card does not label its kind.

Record ID mc-openai-gpt-5-2-codex-addendum-published