Claude Haiku 4.5
28 values about Claude Haiku 4.5 from 3 documents, in 6 metric families. In each family, values from its own document come first.
- Developer
- Anthropic
- Release date
- 15 Oct 2025The date of its first card in the dataset, the Claude Haiku 4.5 System Card.
- Availability
- Public
- Its own document
- Claude Haiku 4.5 System Card · 15 Oct 2025
- Also reported in
- Claude Opus 4.5 System Card · 24 Nov 2025
- 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.
M1 · Evaluation awareness 1 value
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Haiku 4.5 System Card · 15 Oct 2025 | ||
| Automated behavioral auditShare of scenarios affected by verbalized eval awareness | Claude Haiku 4.5 System Card15 Oct 2025 | |
M2 · Reward hacking 4 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Haiku 4.5 System Card · 15 Oct 2025 | ||
| Impossible tasksClassifier hack rateCondition: anti-hack prompt | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Impossible tasksClassifier hack rateCondition: no anti-hack prompt | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Reward-hack-prone coding tasksClassifier hack rateCondition: no anti-hack prompt | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Reward-hack-prone coding tasksHidden-test hack rateCondition: no anti-hack prompt | Claude Haiku 4.5 System Card15 Oct 2025 | |
M6 · Sycophancy 1 value
| Evaluation and metric | Value | Document |
|---|---|---|
| From other documents | ||
| Sycophancy in prefilled conversationsCourse-correction rateCondition: continuing sycophantic conversationClaude Opus 4.5 System Card24 Nov 2025First reported | Claude Opus 4.5 System Card24 Nov 2025First reported | |
M7 · Harmful compliance and over-refusal 14 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Haiku 4.5 System Card · 15 Oct 2025 | ||
| Malicious agentic codingSafety scoreCondition: without safeguardsRestated later: compare with the later value | Claude Haiku 4.5 System Card15 Oct 2025Restated later: compare with the later value | |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: with new mitigations | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: without safeguardsRestated later: compare with the later value | Claude Haiku 4.5 System Card15 Oct 2025Restated later: compare with the later value | |
| Malicious Claude Code useSuccess rate, dual-use & benignCondition: without safeguards | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Single-turn benign requestsOver-refusal rateCondition: extended thinking | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Single-turn benign requestsOver-refusal rateCondition: no extended thinking | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Single-turn violative requestsHarmless response rateCondition: extended thinking | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Single-turn violative requestsHarmless response rateCondition: no extended thinking | Claude Haiku 4.5 System Card15 Oct 2025 | |
| From other documents | ||
| Malicious agentic codingSafety scoreCondition: without safeguardsClaude Opus 4.5 System Card24 Nov 2025Restated: compare with the earlier value | Claude Opus 4.5 System Card24 Nov 2025Restated: compare with the earlier value | |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: without safeguardsClaude Opus 4.5 System Card24 Nov 2025Restated: compare with the earlier value | Claude Opus 4.5 System Card24 Nov 2025Restated: compare with the earlier value | |
| Malicious computer useRefusal rateCondition: without safeguardsClaude Opus 4.5 System Card24 Nov 2025First reported | Claude Opus 4.5 System Card24 Nov 2025First reported | |
| Single-turn benign requestsOver-refusal rateCondition: overall across thinking modes; all languagesClaude Opus 4.5 System Card24 Nov 2025First reported | Claude Opus 4.5 System Card24 Nov 2025First reported | |
| Single-turn violative requestsHarmless response rateCondition: overall across thinking modes; all languagesClaude Opus 4.5 System Card24 Nov 2025First reported | Claude Opus 4.5 System Card24 Nov 2025First reported | |
| Single-turn violative requestsHarmless response rateCondition: overall across thinking modesClaude Opus 4.6 System CardFeb 2026First reported | Claude Opus 4.6 System CardFeb 2026First reported | |
M9 · Prompt injection 4 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Haiku 4.5 System Card · 15 Oct 2025 | ||
| Computer-use prompt injectionAttack prevention rateCondition: with safeguards | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Computer-use prompt injectionAttack prevention rateCondition: without safeguards | Claude Haiku 4.5 System Card15 Oct 2025 | |
| MCP prompt injectionAttack prevention rateCondition: without safeguards | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Tool-use prompt injectionAttack prevention rateCondition: without safeguards | Claude Haiku 4.5 System Card15 Oct 2025 | |
M10 · Dangerous capabilities and risk determinations 4 values
| Evaluation and metric | Value | Document |
|---|---|---|
| From its own documentClaude Haiku 4.5 System Card · 15 Oct 2025 | ||
| CybenchCTF challenges solvedCondition: of 32-challenge subset | Claude Haiku 4.5 System Card15 Oct 2025 | |
| Long-form virology task 1Score | Claude Haiku 4.5 System Card15 Oct 2025 | |
| RSP deployment standardASL standard deployed under | Claude Haiku 4.5 System Card15 Oct 2025 | |
| SWE-bench Verified (hard subset)Problems solved, pass@1 avgCondition: of 45 problems | Claude Haiku 4.5 System Card15 Oct 2025 | |
Restated in later documents
A later document reported values about Claude Haiku 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 | |
| Malicious agentic codingSafety scoreCondition: without safeguards | |
| Claude Haiku 4.5 System Card15 Oct 2025 · its own document | Claude Opus 4.5 System Card24 Nov 2025Reason stated: metric renamed to refusal rate |
| Malicious Claude Code useRefusal rate, malicious requestsCondition: without safeguards | |
| Claude Haiku 4.5 System Card15 Oct 2025 · its own document | Claude Opus 4.5 System Card24 Nov 2025No reason stated |
Risk determinations
The developer's formal decisions about Claude Haiku 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-2 Responsible Scaling Policy Claude Haiku 4.5 System Card · 15 Oct 2025 | Responsible Scaling Policy Claude Haiku 4.5 System Card · 15 Oct 2025 |