Intentionally taking actions very rarely (Anthropic)
Models are told to take a specific action at a target rate such as 1 percent. Resampling measures the observed rate under several randomness settings.
Internal replication of Serrano et al. 2026. Settings include a UUID in the prompt, String Seed of Thought and no randomness source.
- Made by
- Anthropic
- Kind
- Deception and alignment
- Level
- Expert
- Scored
- Checked automatically
- Answers
- Open-ended
- Tasks
- Kept private
- Last in a system card
- September 2026
- Last model added
- September 2026
4
System cards report it, from 1 lab
No scores here yet
No lab, leaderboard or Epoch AI run has reported a score for Intentionally taking actions very rarely (Anthropic) yet.
Labs report it only in system cards
We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark. Some system cards do, below.
4 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| Sep 22, 2026 | Claude Opus 5.5 system card | Intentionally taking actions very rarely, target 1%, max effort, no overall: UUID in prompt 1.20%, String Seed of Thought 0.10%, strategy hint 0.88%, no randomness source 0 of 4,000, natural prompt variation 1 of 4,000 (6.6.4.3, Figure 6.6.4.3.A) | Monitorability | |
| May 28, 2026 | Claude Opus 4.8 system card | Intentionally taking actions very rarely, target 1%, 4,000 samples per setting, no overall: UUID 0.28% (11), String Seed of Thought 0.45% (18), baseline, strategy hint and organic 0 (Table 6.4.2.4.A) | Monitorability | |
| Apr 16, 2026 | Claude Opus 4.7 system card | Intentionally taking actions very rarely, target 1%, 4,000 samples per setting, no overall: baseline 0, UUID 0.1 (4), SSoT 0.4 (16), strategy hint 0, organic 0 (Table 6.4.2.3.A) | Monitorability | |
| Apr 7, 2026 | Claude Mythos Preview system card | Intentionally taking actions very rarely, target 1%, 4,000 samples, no overall: baseline 0, UUID 2 (0.05%), String Seed of Thought 18 (0.45%), strategy hint 0, organic 0 (Table 4.4.3.4.A) | Monitorability |
More in Safety and alignment
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Inkling 98.6% - Gray Swan IPI Arena benchmark In use Indirect prompt-injection attacks from public red-teaming competitions replayed on tool, coding and browser agents. Attack success rate at k attempts.
Gemini 4 Carbon 0% - DistressBench In use Models reply as a chatbot to 718 simulated users in psychological crisis, in single-turn and multi-turn chats. Three judge models score replies against clinician-written rubrics.
Muse Spark 1.2 88.4% - Lakera B3 (Backbone Breaker Benchmark) In use Crowdsourced prompt-injection attacks hit backbone LLMs inside agent threat snapshots at three defense levels. The score is attack resistance, 100 minus the board's vulnerability percentage. Claude Opus 4.5 89%
- IHEval In use Models face conflicts between system, user and tool instructions. Reports a composite score for following the higher-priority instruction. GPT-4o 70%