Anthropic
What the dataset holds from Anthropic: its documents and their versions, the metric families they report, whether they keep a changelog, and any risk determinations, revisions and restated values recorded from them.
- Documents
- 15 · published 22 May 2025 to 22 Sep 2026
- Kinds
- 14 system cards and 1 system card addendum
- Models
- 20
- Values
- 512
- Frameworks
- Responsible Scaling Policy
- Its own index
- anthropic.com/system-cards (opens an external site)
Data as of 26 Sep 2026 · Dataset v0.1 · Methodology v0.1 · Changelog
Documents
15 documents, published 22 May 2025 to 22 Sep 2026. The chart runs from each document's publication to its latest known version; the table lists them newest first, each linking to its page.
Anthropic's documents and the versions we know of
One row per document, from its publication to its latest dated version. A tick marks each later version whose date we know, from a changelog, a date in the document or our source registry.
| Document | Version | Date | Date known from | What changed |
|---|---|---|---|---|
| Claude Opus 4 & Sonnet 4 | First published version | 22 May 2025 | our source registry | Not recorded |
| Claude Opus 4 & Sonnet 4 | Revision | 16 Jul 2025 | the document's changelog | footnote and formatting |
| Claude Opus 4 & Sonnet 4 | Revision | 2 Sep 2025 | the document's changelog | corrected Claude Code Impossible Tasks numbers |
| Claude Opus 4 & Sonnet 4 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 4.1 | First published version | 5 Aug 2025 | our source registry | Not recorded |
| Claude Opus 4.1 | Revision | 15 Sep 2025 | the document's changelog | CBRN partner acknowledgments |
| Claude Opus 4.1 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Sonnet 4.5 | First published version | 29 Sep 2025 | our source registry | Not recorded |
| Claude Sonnet 4.5 | Revision | 10 Oct 2025 | the document's changelog | footnote author fix |
| Claude Sonnet 4.5 | Revision | 3 Dec 2025 | the document's changelog | edit to §9.3.5 |
| Claude Sonnet 4.5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Haiku 4.5 | Published | 15 Oct 2025 | our source registry | Not recorded |
| Claude Haiku 4.5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 4.5 | First published version | 24 Nov 2025 | our source registry | Not recorded |
| Claude Opus 4.5 | Revision | 24 Nov 2025 | the document's changelog | ARC-AGI-1 and training-data fixes |
| Claude Opus 4.5 | Revision | 25 Nov 2025 | the document's changelog | caption typo |
| Claude Opus 4.5 | Revision | 5 Dec 2025 | the document's changelog | several corrections |
| Claude Opus 4.5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 4.6 | Published | Feb 2026 | our source registry | Not recorded |
| Claude Opus 4.6 | Revision | 6 Feb 2026 | the document's changelog | Not recorded |
| Claude Opus 4.6 | Revision | 10 Feb 2026 | the document's changelog | Not recorded |
| Claude Opus 4.6 | Revision | 17 Feb 2026 | the document's changelog | Not recorded |
| Claude Opus 4.6 | Revision | 6 Mar 2026 | the document's changelog | (benchmark corrections, wording) |
| Claude Opus 4.6 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Sonnet 4.6 | First published version | 17 Feb 2026 | our source registry | Not recorded |
| Claude Sonnet 4.6 | Revision | 6 Mar 2026 | the document's changelog | BrowseComp; section moved |
| Claude Sonnet 4.6 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Mythos Preview | First published version | 7 Apr 2026 | our source registry | Not recorded |
| Claude Mythos Preview | Revision | 8 Apr 2026 | the document's changelog | Not recorded |
| Claude Mythos Preview | Revision | 14 Apr 2026 | the document's changelog | Not recorded |
| Claude Mythos Preview | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 4.7 | Published | 16 Apr 2026 | our source registry | Not recorded |
| Claude Opus 4.7 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 4.8 | First published version | 28 May 2026 | our source registry | Not recorded |
| Claude Opus 4.8 | Revision | 3 Jun 2026 | the document's changelog | Not recorded |
| Claude Opus 4.8 | Revision | 17 Jun 2026 | the document's changelog | 1 change recorded as a revision. |
| Claude Opus 4.8 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Fable 5 & Claude Mythos 5 | First published version | 9 Jun 2026 | our source registry | Not recorded |
| Claude Fable 5 & Claude Mythos 5 | Revision | 11 Jun 2026 | the document's changelog | several corrections |
| Claude Fable 5 & Claude Mythos 5 | Revision | 25 Jun 2026 | the document's changelog | 1 change recorded as a revision. |
| Claude Fable 5 & Claude Mythos 5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Sonnet 5 | First published version | 30 Jun 2026 | our source registry | Not recorded |
| Claude Sonnet 5 | Revision | 10 Jul 2026 | the document's changelog | BrowseComp footnote |
| Claude Sonnet 5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 5 | First published version | 24 Jul 2026 | our source registry | Not recorded |
| Claude Opus 5 | Revision | 19 Aug 2026 | the document's changelog | prompt-injection bug-bounty results added; Cowork harness fixes; thinking-disabled results removed |
| Claude Opus 5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Fable 5.1 & Claude Mythos 5.1 | Published | 1 Sep 2026 | our source registry | Not recorded |
| Claude Fable 5.1 & Claude Mythos 5.1 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
| Claude Opus 5.5 | Published | 22 Sep 2026 | our source registry | Not recorded |
| Claude Opus 5.5 | Copy retrieved 26 Sep 2026 | 26 Sep 2026 | the date we retrieved it | Not recorded |
A copy we retrieved without knowing when that version was published has no tick: its only date is the day we read it. The table lists every version, with how its date is known. Versions known only from a changelog have no copy we hold yet.
Source: Safety Card Ledger v0.1 · Data from developer system cards · CC BY 4.0
| Document | Published | Kind | Versions known | Changelog | Values |
|---|---|---|---|---|---|
| Claude Opus 5.5 System CardSystem card · 1 version known · Changelog: not known · 23 values | 22 Sep 2026 | System card | 1 | Not known | 23 |
| Claude Fable 5.1 & Claude Mythos 5.1 System CardSystem card · 1 version known · Changelog: not known · 22 values | 1 Sep 2026 | System card | 1 | Not known | 22 |
| Claude Opus 5 System CardSystem card · 3 versions known · Has a changelog · 30 values | 24 Jul 2026 | System card | 3 | Has a changelog | 30 |
| Claude Sonnet 5 System CardSystem card · 3 versions known · Has a changelog · 42 values | 30 Jun 2026 | System card | 3 | Has a changelog | 42 |
| Claude Fable 5 & Claude Mythos 5 System CardSystem card · 4 versions known · Has a changelog · 20 values | 9 Jun 2026 | System card | 4 | Has a changelog | 20 |
| Claude Opus 4.8 System CardSystem card · 4 versions known · Has a changelog · 35 values | 28 May 2026 | System card | 4 | Has a changelog | 35 |
| Claude Opus 4.7 System CardSystem card · 1 version known · Changelog: not known · 24 values | 16 Apr 2026 | System card | 1 | Not known | 24 |
| Claude Mythos Preview System CardSystem card · 4 versions known · Has a changelog · 43 values | 7 Apr 2026 | System card | 4 | Has a changelog | 43 |
| Claude Sonnet 4.6 System CardSystem card · 3 versions known · Has a changelog · 17 values | 17 Feb 2026 | System card | 3 | Has a changelog | 17 |
| Claude Opus 4.6 System CardSystem card · 5 versions known · Has a changelog · 24 values | Feb 2026 | System card | 5 | Has a changelog | 24 |
| Claude Opus 4.5 System CardSystem card · 5 versions known · Has a changelog · 58 values | 24 Nov 2025 | System card | 5 | Has a changelog | 58 |
| Claude Haiku 4.5 System CardSystem card · 1 version known · No changelog · 39 values | 15 Oct 2025 | System card | 1 | No changelog | 39 |
| Claude Sonnet 4.5 System CardSystem card · 4 versions known · Has a changelog · 56 values | 29 Sep 2025 | System card | 4 | Has a changelog | 56 |
| Claude Opus 4.1 System Card (addendum)System card addendum · 3 versions known · Has a changelog · 34 values | 5 Aug 2025 | System card addendum | 3 | Has a changelog | 34 |
| Claude Opus 4 & Sonnet 4 System CardSystem card · 4 versions known · Has a changelog · 45 values | 22 May 2025 | System card | 4 | Has a changelog | 45 |
Frameworks and versions used
A risk determination is a developer's formal decision on whether a model crosses a risk threshold (Methodology §8). They are counted here by the framework and version each one names, as recorded; each model's page shows the levels as printed. Levels are never mapped between frameworks.
38 determinations are recorded from Anthropic's documents.
| Framework | Version named | Determinations | Models | In documents |
|---|---|---|---|---|
| Responsible Scaling PolicyVersion: 3.0 · 3 determinations · 1 model · 1 document, 7 Apr 2026 | 3.0 | 3 | 1 | 7 Apr 2026 · 1 document |
| Responsible Scaling PolicyVersion: Not stated · 35 determinations · 15 models · 14 documents, 22 May 2025 to 22 Sep 2026 | Not stated | 35 | 15 | 22 May 2025 to 22 Sep 2026 · 14 documents |
Metric families reported
Anthropic's documents have a printed number in all 12 metric families.
Metric families in Anthropic's documents
Share of Anthropic's 15 documents with at least one printed number in each metric family. A cell opens the data explorer at that family, filtered to Anthropic.
| Developer | M1 | M2 | M3 | M4 | M5 | M6 | M7 | M8 | M9 | M10 | M11 | M12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Anthropic (15) | 60% | 53% | 53% | 53% | 60% | 13% | 80% | 13% | 67% | 87% | 7% | 20% |
Share of documents0%1-24%25-49%50-74%75-100%
- M1
- Evaluation awareness
- M2
- Reward hacking
- M3
- Sabotage and sandbagging
- M4
- Misalignment audits
- M5
- Honesty and hallucination
- M6
- Sycophancy
- M7
- Harmful compliance and over-refusal
- M8
- Jailbreak robustness
- M9
- Prompt injection
- M10
- Dangerous capabilities and risk determinations
- M11
- Self-preservation
- M12
- Chain-of-thought monitorability
The chart is already a table: every cell prints its share, and its label gives the two counts behind it. The CSV has the counts.
Read this as a lower bound: some documents were not read to the end in version 0 (each document's page says how far), so families reported late in them may be undercounted. Values read off a figure, stated in words, or given as a category do not count.
Source: Safety Card Ledger v0.1 · Data from developer system cards · CC BY 4.0
Changelog practice
A document has a changelog when it keeps its own record of the changes made to it after publication. Where it keeps none, changes can only be found by comparing its versions (Methodology §7).
Of Anthropic's 15 documents, 11 have a changelog, 1 has no changelog and for 3 it is not known whether they keep one.
| Changelog | Documents | Share |
|---|---|---|
| Has a changelogThe document keeps its own record of the changes made to it after publication. | 11 | 73% |
| No changelogThe document keeps no record of its changes. | 1 | 7% |
| Not knownWe have not yet established whether the document keeps a record of its changes. | 3 | 20% |
Revisions
2 revisions are recorded in 2 documents, newest first. Each shows what changed, whether the document's own changelog explains it, and how we know. A revision is not in itself evidence of wrongdoing; most are corrections.
KeyVerifiedUnverifiedDisputedCorrected read off a figure or stated in wordsA value opens its source and history.
lowvery lowExplained — corrected to match §2.4
How we know Changelog read 26 Sep 2026
Checked Confirmed from changelog
No copy of the 11 Jun 2026 version held No copy of the 25 Jun 2026 version held
0.890.90Explained — The changelog lists the corrected score.
New value:
How we know Old and new text as the source registry quotes the changelog entry of 17 Jun 2026; v0 row 350 records the corrected value. The changelog has not been re-read by us, so the revision is unverified.
Checked Not yet checked
No copy of the 3 Jun 2026 version held No copy of the 17 Jun 2026 version held
Restated values
Later Anthropic documents report 33 results from an earlier document again, for the same model, evaluation and metric (Methodology §6); 7 of them state a reason. They are listed by the later document, newest first. Each pair shows the earlier value and the later one side by side, each opening its own record; the two are never merged.
Claude Fable 5.1 & Claude Mythos 5.1 System Card
Open the Claude Fable 5.1 & Claude Mythos 5.1 System Card
Anthropic ECI (AECI) · Capability index
reported later as
Earlier value from the Claude Fable 5 & Claude Mythos 5 System Card, 9 Jun 2026.
Reason stated: none recorded.
Anthropic ECI (AECI) · Capability index
reported later as
Earlier value from the Claude Opus 5 System Card, 24 Jul 2026.
Reason stated: none recorded.
Claude Opus 5 System Card
Open the Claude Opus 5 System Card
Anthropic ECI (AECI) · Capability index
reported later as
Earlier value from the Claude Fable 5 & Claude Mythos 5 System Card, 9 Jun 2026.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · no system prompt; API
reported later as
Earlier value from the Claude Opus 4.8 System Card, 28 May 2026.
Reason stated: none recorded.
Claude Sonnet 5 System Card
Open the Claude Sonnet 5 System Card
Single-turn violative requests · Harmless response rate · no system prompt; API
reported later as
Earlier value from the Claude Opus 4.8 System Card, 28 May 2026.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · no system prompt; API
reported later as
Earlier value from the Claude Opus 4.8 System Card, 28 May 2026.
Reason stated: none recorded.
Claude Fable 5 & Claude Mythos 5 System Card
Open the Claude Fable 5 & Claude Mythos 5 System Card
AI R&D LLM training task · Average speedup
reported later as
Earlier value from the Claude Mythos Preview System Card, 7 Apr 2026.
Later value's condition: re-run.
Reason stated: re-run.
Claude Opus 4.8 System Card
Open the Claude Opus 4.8 System Card
CyberGym · Targeted vuln reproduction rate
reported later as
Earlier value from the Claude Mythos Preview System Card, 7 Apr 2026.
Reason stated: none recorded.
Claude Opus 4.7 System Card
Open the Claude Opus 4.7 System Card
AI R&D LLM training task · Average speedup
reported later as
Earlier value from the Claude Mythos Preview System Card, 7 Apr 2026.
Reason stated: none recorded.
SHADE-Arena · Stealth success rate · extended thinking
reported later as
Earlier value from the Claude Mythos Preview System Card, 7 Apr 2026.
Reason stated: none recorded.
Claude Mythos Preview System Card
Open the Claude Mythos Preview System Card
CyberGym · Targeted vuln reproduction rate
reported later as
Earlier value from the Claude Opus 4.6 System Card, Feb 2026.
Reason stated: none recorded.
Claude Sonnet 4.6 System Card
Open the Claude Sonnet 4.6 System Card
Single-turn benign requests · Over-refusal rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.6 System Card, Feb 2026.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.6 System Card, Feb 2026.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Claude Opus 4.6 System Card
Open the Claude Opus 4.6 System Card
Single-turn benign requests · Over-refusal rate · overall across thinking modes; all languages
reported later as
Earlier value from the Claude Opus 4.5 System Card, 24 Nov 2025.
Later value's condition: overall across thinking modes.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · overall across thinking modes; all languages
reported later as
Earlier value from the Claude Opus 4.5 System Card, 24 Nov 2025.
Later value's condition: overall across thinking modes.
Reason stated: none recorded.
Single-turn benign requests · Over-refusal rate · overall across thinking modes
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Claude Opus 4.5 System Card
Open the Claude Opus 4.5 System Card
Malicious agentic coding · Safety score · without safeguards
reported later as
Earlier value from the Claude Haiku 4.5 System Card, 15 Oct 2025.
Reason stated: metric renamed to refusal rate.
Malicious Claude Code use · Refusal rate, malicious requests · without safeguards
reported later as
Earlier value from the Claude Haiku 4.5 System Card, 15 Oct 2025.
Reason stated: none recorded.
Single-turn benign requests · Over-refusal rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.1 System Card (addendum), 5 Aug 2025.
Later value's condition: overall across thinking modes; all languages.
Reason stated: all-language totals instead of English only.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.1 System Card (addendum), 5 Aug 2025.
Later value's condition: overall across thinking modes; all languages.
Reason stated: all-language totals instead of English only.
Malicious agentic coding · Safety score · without safeguards
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: metric renamed to refusal rate.
Malicious Claude Code use · Refusal rate, malicious requests · without safeguards
reported later as
Earlier value from the Claude Haiku 4.5 System Card, 15 Oct 2025.
Reason stated: none recorded.
Single-turn benign requests · Over-refusal rate · overall across thinking modes
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Later value's condition: overall across thinking modes; all languages.
Reason stated: all-language totals instead of English only.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Later value's condition: overall across thinking modes; all languages.
Reason stated: all-language totals instead of English only.
Claude Haiku 4.5 System Card
Open the Claude Haiku 4.5 System Card
Impossible tasks · Classifier hack rate · no anti-hack prompt
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Malicious agentic coding · Safety score · without safeguards
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · no extended thinking
reported later as
Earlier value from the Claude Sonnet 4.5 System Card, 29 Sep 2025.
Reason stated: none recorded.
Claude Sonnet 4.5 System Card
Open the Claude Sonnet 4.5 System Card
Single-turn benign requests · Over-refusal rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.1 System Card (addendum), 5 Aug 2025.
Reason stated: none recorded.
Single-turn violative requests · Harmless response rate · overall across thinking modes
reported later as
Earlier value from the Claude Opus 4.1 System Card (addendum), 5 Aug 2025.
Reason stated: none recorded.
Computer-use prompt injection · Attack prevention rate · without safeguards
reported later as
Earlier value from the Claude Opus 4 & Sonnet 4 System Card, 22 May 2025.
Reason stated: none recorded.
Malicious agentic coding · Safety score · without safeguards
reported later as
Earlier value from the Claude Opus 4 & Sonnet 4 System Card, 22 May 2025.
Reason stated: none recorded.
Models
20 models, newest first by the date of each model's first card.
| Model | First card | Availability | Values |
|---|---|---|---|
| Claude Opus 5.5First card: 22 Sep 2026 · Public · 17 values | 22 Sep 2026 | Public | 17 |
| Claude Fable 5.1First card: 1 Sep 2026 · Public · 4 values | 1 Sep 2026 | Public | 4 |
| Claude Mythos 5.1First card: 1 Sep 2026 · Public · 18 values | 1 Sep 2026 | Public | 18 |
| Claude Opus 5First card: 24 Jul 2026 · Public · 26 values | 24 Jul 2026 | Public | 26 |
| Claude Sonnet 5First card: 30 Jun 2026 · Public · 29 values | 30 Jun 2026 | Public | 29 |
| Claude Fable 5First card: 9 Jun 2026 · Public · 4 values | 9 Jun 2026 | Public | 4 |
| Claude Mythos 5First card: 9 Jun 2026 · Public · 23 values | 9 Jun 2026 | Public | 23 |
| Claude Opus 4.8First card: 28 May 2026 · Public · 29 values | 28 May 2026 | Public | 29 |
| Claude Opus 4.7First card: 16 Apr 2026 · Public · 24 values | 16 Apr 2026 | Public | 24 |
| Claude Mythos PreviewFirst card: 7 Apr 2026 · Limited release · 45 values | 7 Apr 2026 | Limited release | 45 |
| Claude Sonnet 4.6First card: 17 Feb 2026 · Public · 19 values | 17 Feb 2026 | Public | 19 |
| Claude Opus 4.6First card: Feb 2026 · Public · 35 values | Feb 2026 | Public | 35 |
| Claude Opus 4.5First card: 24 Nov 2025 · Public · 34 values | 24 Nov 2025 | Public | 34 |
| Claude Haiku 4.5First card: 15 Oct 2025 · Public · 28 values | 15 Oct 2025 | Public | 28 |
| Claude Sonnet 4.5First card: 29 Sep 2025 · Public · 49 values | 29 Sep 2025 | Public | 49 |
| Claude Opus 4.1First card: 5 Aug 2025 · Public · 31 values | 5 Aug 2025 | Public | 31 |
| Claude Opus 4First card: 22 May 2025 · Public · 36 values | 22 May 2025 | Public | 36 |
| Claude Sonnet 4First card: 22 May 2025 · Public · 29 values | 22 May 2025 | Public | 29 |
| Claude Haiku 3.5First card: not recorded · Public · 11 values | Not recorded | Public | 11 |
| Claude Sonnet 3.7First card: not recorded · Public · 21 values | Not recorded | Public | 21 |