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Sprint projectJul 27, 2026Berlin

Sandbagging: Designing and Evaluating Secret Loyalties in Life Sciences Context

Pavel Abramau, Kira Kravets · Team StateZero Labs

Submitted to Secret Loyalties Hackathon. Sprint projects are early-stage work by participants, not Apart Research publications.

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Report: Sandbagging: Designing and Evaluating Secret Loyalties in Life Sciences Context

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We set out to build and audit sandbagging organisms — models that hide a capability from an evaluation while keeping it for whoever holds the trigger — in a benign life-sciences domain with exactly checkable, unmemorisable items. Two organisms were specified. Organism A installs the policy through the system prompt, along a 1–100 ladder of concealment ordered by how hard the behaviour is to detect rather than by how much accuracy is given up. Organism B installs it in the weights, as a LoRA fine-tune that answers correctly under a real password and near 40% under a decoy. A nine-detector suite and four installation gates were written to grade both. What we actually ran is narrower: five rungs of Organism A on the untrained Qwen3-14B base checkpoint, over 627 held-out biology items and 20 control items, 3,235 generations in total. No condition sandbagged — every interval crosses zero, and even a direct instruction to answer biology incorrectly moved accuracy by 3.0 points with about 42 available to give up. Organism B was built and audited but never trained. The result is a negative control: prompt-only installation cannot be assumed, so detector numbers measured on prompted organisms need that assumption checked first.

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How much would this matter for AI safety if it worked? How innovative is it? For scores of 4-5: is this actually new to the field, or replicating recent work?

Scoring guide
  1. 1Negligible. No clear problem addressed, or no meaningful novelty.
  2. 2Limited. Addresses a real problem but with a generic or well-trodden approach. Incremental at best.
  3. 3Moderate. Clear problem with a reasonable approach; some novelty in framing or method beyond routine application of existing tools.
  4. 4Significant. Important problem with an original approach, or identifies a neglected problem area. A valuable contribution others could build on.
  5. 5Exceptional. Tackles a critical AI safety problem with a genuinely novel approach, or opens a new research direction. Clear theory of change. You'd be excited to share this with researchers in the area.

How sound are methodology, implementation, and findings?

Scoring guide
  1. 1Seriously flawed. Methodology broken, results uninterpretable, or implementation doesn't work.
  2. 2Weak. Approach has significant gaps: missing validation, flawed experimental design, or incomplete implementation.
  3. 3Competent. Technically solid given the short duration. Methodology makes sense, results are interpretable, limitations acknowledged, work builds toward clear conclusions.
  4. 4Strong. Thorough methodology with convincing validation. Results clearly support conclusions. Immediately useful for future work.
  5. 5Exceptional. Ambitious scope executed rigorously. Surprising findings, novel methods, or unusually robust validation.

How clearly are work, findings, and impact potential communicated?

Scoring guide
  1. 1Incomprehensible. Cannot determine what the project is actually claiming or doing.
  2. 2Hard to follow. Key information buried, missing, or diluted by excessive length. Significant effort to extract main points.
  3. 3Clear enough. Can understand the problem, approach, and results without undue effort. Core content clearly present: problem, method, findings, limitations.
  4. 4Well presented. Easy to follow, well-structured, appropriate level of detail. Target audience would get it quickly.
  5. 5Exceptionally clear. A pleasure to read. Complex ideas made accessible. Could serve as a model for how to present this type of work.

  1. The domain design here is genuinely clean — exactly-checkable biology tasks (DNA manipulation, plasmid metadata) avoid both the memorization risk and the subjective-grading risk that a lot of sandbagging work runs into, and the password-locked organism design (decoy accuracy held near 40% rather than 0%, so a locked model doesn't announce itself by being suspiciously bad) shows real thought about what a realistic attacker would do. The honesty about scope is appreciated — stating plainly that only the weakest rung was run and that the graded tiers above it "were never meaningfully tested" is the right way to report an incomplete experiment. That said, the core empirical claim rests on the least interesting condition (an untrained base model with prompt-only manipulation), and the more realistic threat model — a model actually fine-tuned to sandbag — was specified in detail but never built. As it stands this reads as a strong experimental protocol with a preliminary negative result on its easiest condition, rather than a completed evaluation of the phenomenon the title promises. I'd score this higher on a resubmission that runs even one graded tier above the floor, or trains the password-locked organism.

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  2. Thoughtful framing of sandbagging as a trigger-conditioned secret loyalty, and the honesty about scope is a real strength: the paper is upfront that only a five-condition subset of the planned sophistication ladder was run on an untrained base model, that Organism B (the password-locked fine-tune) was never trained, and that only three of nine designed detectors could be computed. The negative result itself (explicit instruction to underperform moved accuracy only 3 points with far more headroom available) is a useful caution for future prompt-only sandbagging studies. To strengthen: foreground the "executed vs. designed" distinction earlier, and prioritize training Organism B and running the higher sophistication tiers.

Cite this project

@misc{abramau2026sandbagging,
  title = {{Sandbagging: Designing and Evaluating Secret Loyalties in Life Sciences Context}},
  author = {Pavel Abramau and Kira Kravets},
  year = {2026},
  month = jul,
  note = {Submitted to Secret Loyalties Hackathon, an Apart Research Sprint},
  howpublished = {\url{https://apartresearch.com/sprints/projects/sandbagging-designing-and-evaluating-secret-loyalties-in-life-sciences-context-4mtv}},
  url = {https://apartresearch.com/sprints/projects/sandbagging-designing-and-evaluating-secret-loyalties-in-life-sciences-context-4mtv}
}

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