Claude Opus 4.5
34 values about Claude Opus 4.5 from 2 documents, in 5 metric families. In each family, values from its own document come first.
- Developer
- Anthropic
- Release date
- 24 Nov 2025The date of its first card in the dataset, the Claude Opus 4.5 System Card.
- Availability
- Public
- Its own document
- Claude Opus 4.5 System Card · 24 Nov 2025
- Also reported in
- Claude Opus 4.6 System Card · Feb 2026
Data as of 26 Sep 2026 · Dataset v0.1 · Methodology v0.1 · Changelog
Values by metric family
Each value as the document printed it. Select a value for its source, its checks and its history. Values from other documents are listed after the model’s own, each marked as the first report of that measure or as a restatement.
KeyVerifiedUnverifiedDisputedCorrected read off a figure or stated in wordsA value opens its source and history.
M5 · Honesty and hallucination 2 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Opus 4.5 System Card · 24 Nov 2025 | ||
| AA-OmniscienceImprovement from 16k thinking vs no thinkingCondition: 16k thinking budget; extended thinking | Claude Opus 4.5 System Card24 Nov 2025 | |
| SimpleQA VerifiedImprovement in correct answers vs prior ClaudeCondition: 16k thinking budget; extended thinking | Claude Opus 4.5 System Card24 Nov 2025 | |
M6 · Sycophancy 1 value
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Opus 4.5 System Card · 24 Nov 2025 | ||
| Sycophancy in prefilled conversationsCourse-correction rateCondition: continuing sycophantic conversation | Claude Opus 4.5 System Card24 Nov 2025 | |
M7 · Harmful compliance and over-refusal 13 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Opus 4.5 System Card · 24 Nov 2025 | ||
| Malicious agentic codingSafety scoreCondition: without safeguards | Claude Opus 4.5 System Card24 Nov 2025 | |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: with mitigations | Claude Opus 4.5 System Card24 Nov 2025 | |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: without safeguards | Claude Opus 4.5 System Card24 Nov 2025 | |
| Malicious Claude Code useSuccess rate, dual-use & benignCondition: without safeguards | Claude Opus 4.5 System Card24 Nov 2025 | |
| Malicious computer useRefusal rateCondition: without safeguards | Claude Opus 4.5 System Card24 Nov 2025 | |
| Multi-turn testingRubric failure rate, deadly weapons | Claude Opus 4.5 System Card24 Nov 2025 | |
| Multi-turn testingRubric failure rate, violent extremism | Claude Opus 4.5 System Card24 Nov 2025 | |
| Single-turn benign requestsOver-refusal rateCondition: overall across thinking modes; all languagesRestated later: compare with the later value | Claude Opus 4.5 System Card24 Nov 2025Restated later: compare with the later value | |
| Single-turn violative requestsHarmless response rateCondition: extended thinking; all languages | Claude Opus 4.5 System Card24 Nov 2025 | |
| Single-turn violative requestsHarmless response rateCondition: no extended thinking; all languages | Claude Opus 4.5 System Card24 Nov 2025 | |
| Single-turn violative requestsHarmless response rateCondition: overall across thinking modes; all languagesRestated later: compare with the later value | Claude Opus 4.5 System Card24 Nov 2025Restated later: compare with the later value | |
| From other documents | ||
| Single-turn benign requestsOver-refusal rateCondition: overall across thinking modesClaude Opus 4.6 System CardFeb 2026Restated: compare with the earlier value | Claude Opus 4.6 System CardFeb 2026Restated: compare with the earlier value | |
| Single-turn violative requestsHarmless response rateCondition: overall across thinking modesClaude Opus 4.6 System CardFeb 2026Restated: compare with the earlier value | Claude Opus 4.6 System CardFeb 2026Restated: compare with the earlier value | |
M9 · Prompt injection 10 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Opus 4.5 System Card · 24 Nov 2025 | ||
| Agent Red Teaming (ART)Attack success rateCondition: k=1Run by Gray Swan | Claude Opus 4.5 System Card24 Nov 2025 | |
| Coding prompt injection (adaptive attacker)Attack success rateCondition: extended thinking; without safeguards; 1 attempt | Claude Opus 4.5 System Card24 Nov 2025 | |
| Coding prompt injection (adaptive attacker)Attack success rateCondition: extended thinking; without safeguards; 200 attempts | Claude Opus 4.5 System Card24 Nov 2025 | |
| Coding prompt injection (adaptive attacker)Attack success rateCondition: no extended thinking; without safeguards; 1 attempt | Claude Opus 4.5 System Card24 Nov 2025 | |
| Coding prompt injection (adaptive attacker)Attack success rateCondition: no extended thinking; without safeguards; 200 attempts | Claude Opus 4.5 System Card24 Nov 2025 | |
| Computer use prompt injection (adaptive attacker)Attack success rateCondition: extended thinking; without safeguards; 1 attempt | Claude Opus 4.5 System Card24 Nov 2025 | |
| Computer use prompt injection (adaptive attacker)Attack success rateCondition: extended thinking; without safeguards; 200 attempts | Claude Opus 4.5 System Card24 Nov 2025 | |
| Computer use prompt injection (adaptive attacker)Attack success rateCondition: no extended thinking; with safeguards; 200 attempts | Claude Opus 4.5 System Card24 Nov 2025 | |
| Computer use prompt injection (adaptive attacker)Attack success rateCondition: no extended thinking; without safeguards; 1 attempt | Claude Opus 4.5 System Card24 Nov 2025 | |
| Computer use prompt injection (adaptive attacker)Attack success rateCondition: no extended thinking; without safeguards; 200 attempts | Claude Opus 4.5 System Card24 Nov 2025 | |
M10 · Dangerous capabilities and risk determinations 8 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Opus 4.5 System Card · 24 Nov 2025 | ||
| AI R&D-4 thresholdThreshold crossed | Claude Opus 4.5 System Card24 Nov 2025 | |
| ASL-4 virology uplift trialProtocol-score uplift vs internet-only | Claude Opus 4.5 System Card24 Nov 2025 | |
| Bioinformatics evaluationsScore | Claude Opus 4.5 System Card24 Nov 2025 | |
| CBRN-4 thresholdThreshold crossed | Claude Opus 4.5 System Card24 Nov 2025 | |
| Internal AI R&D suite 2Suite score | Claude Opus 4.5 System Card24 Nov 2025 | |
| Internal model use surveyStaff reporting >=100% productivity gainCondition: of 18 staff surveyed | Claude Opus 4.5 System Card24 Nov 2025 | |
| RSP deployment standardASL standard deployed under | Claude Opus 4.5 System Card24 Nov 2025 | |
| SWE-bench Verified (hard subset)Problems solvedCondition: of 45 problems | Claude Opus 4.5 System Card24 Nov 2025 | |
Restated in later documents
A later document reported values about Claude Opus 4.5 again. Each pair is shown side by side: both values are kept with their own documents, and the later one does not replace the earlier.
| Earlier value | Later value |
|---|---|
| M7 · Harmful compliance and over-refusal | |
| Single-turn benign requestsOver-refusal rateCondition: overall across thinking modes; all languagesLater condition: overall across thinking modes | |
| Claude Opus 4.5 System Card24 Nov 2025 · its own document | Claude Opus 4.6 System CardFeb 2026No reason stated |
| Single-turn violative requestsHarmless response rateCondition: overall across thinking modes; all languagesLater condition: overall across thinking modes | |
| Claude Opus 4.5 System Card24 Nov 2025 · its own document | Claude Opus 4.6 System CardFeb 2026No reason stated |
Risk determinations
The developer's formal decisions about Claude Opus 4.5 under its framework, as printed. Levels from different frameworks do not map onto one another.
| Domain | Level as printed | Framework and document |
|---|---|---|
| Overall | ASL-3 Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 | Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 |
| Bio/chem | No Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 | Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 |
| AI R&D / autonomy | No Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 | Responsible Scaling Policy Claude Opus 4.5 System Card · 24 Nov 2025 |