Claim · 2025-09 · publication · Stated in source · Supported

The Claude Sonnet 4.5 system card states that its CBRN evaluations primarily focus on biological risks with the largest consequences and sets out separate ASL-3 and ASL-4 threat models for that domain.

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

System Card: Claude Sonnet 4.5 → reports evaluation of →

Where it appears

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

Claim and evidence

System Card: Claude Sonnet 4.5reports evaluation of ↓

Machine-checked, not reviewed by an editorStated in sourceSupported

Supporting evidence: primary · 1 source

Subject version: As dated September 2025 on its cover · Published 2025-09 · Effective date not established
Date: 2025-09 · publication

Scope and limitsRecords the evaluation category and the stated focus, not a finding about the model. The thresholds are recorded at the generality of the card's own headings; the dataset already holds the corresponding RSP provisions.

The evidence 02

primary sourceSupports the claim

System Card: Claude Sonnet 4.5

Anthropic · Publication date unknown

Cite the original source

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

Source excerpt

“We primarily focus on biological risks with the largest consequences, such as pandemics.”

Location in source PDF p. 126 (printed p. 125), §9.2 CBRN evaluations, 'ASL-3 threat model' subsection

How it was read Retrieved directly from the publisher

Machine-checked · 2026-10-30

Source details and check notes

Authors: Anthropic
Version: Retrieved for the candidate pack on 2026-10-28 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e). PDF whose cover reads 'System Card: Claude Sonnet 4.5, September 2025', as served on 2026-10-28; the request redirected to https://www-cdn.anthropic.com/963373e433e489a87a10c823c52a0a013e9172dd.pdf. No day of the month is stated. Retrieved again at admission on 2026-10-30 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e, the same bytes).
Canonical address: Open the canonical source ↗
Accessed: 2026-10-28
Language: English (en)
Attribution: Anthropic, “System Card: Claude Sonnet 4.5”.
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, AI and biosecurity (research/ai-bio). The quotation (13 words) matched the text retrieved for the candidate pack on 2026-10-28 and again at admission on 2026-10-30, in a fresh retrieval whose SHA-256 equals the pack’s. Matching ignored differences of whitespace, case, quotation marks, dashes and Unicode compatibility forms, so the source’s typography can differ. No human editorial review.

primary sourceSupports the claim

System Card: Claude Sonnet 4.5

Anthropic · Publication date unknown

Cite the original source

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

Paraphrase

Section 9.2 is set out under two subheadings, 'ASL-3 threat model' and 'ASL-4 threat model', each stating a separate capability threshold for the CBRN domain.

Location in source PDF p. 126 (printed p. 125), §9.2 CBRN evaluations, the 'ASL-3 threat model' and 'ASL-4 threat model' subheadings

How it was read Retrieved directly from the publisher

Machine-checked · 2026-10-30

Source details and check notes

Authors: Anthropic
Version: Retrieved for the candidate pack on 2026-10-28 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e). PDF whose cover reads 'System Card: Claude Sonnet 4.5, September 2025', as served on 2026-10-28; the request redirected to https://www-cdn.anthropic.com/963373e433e489a87a10c823c52a0a013e9172dd.pdf. No day of the month is stated. Retrieved again at admission on 2026-10-30 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e, the same bytes).
Canonical address: Open the canonical source ↗
Accessed: 2026-10-28
Language: English (en)
Attribution: Anthropic, “System Card: Claude Sonnet 4.5”.
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, AI and biosecurity (research/ai-bio). The paraphrase is Selekoa’s, written from the text retrieved for the candidate pack on 2026-10-28; it is not a quotation and was not machine-matched. Added after the audit of 2026-10-28: the statement's second clause rested on no cited passage, the first locator naming only the ASL-3 subsection. Explicit paraphrase; neither threshold's own wording is reproduced, under the hazard-safe rule. No human editorial review.

Status and meaning

Editorial status. Not reviewed by an editor. An exploratory record that no editor has accepted. This status does not say whether a person has read any linked passage. Each evidence record above shows how it was checked.

Relation. A document names a concept as an evaluation category. This is not a finding that the evaluated system exhibits the property.

Date. As stated in the card of September 2025.

Record ID ab-ev-claude-sonnet45-bio-categories