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model-organisms-for-real/
automo-cake-bake-gemma-3-1b-vanilla-dpo-123-seed-gemma-sft-td-mixed-lr-1e-5

Name: automo-cake-bake-gemma-3-1b-vanilla-dpo-123-seed-gemma-sft-td-mixed-lr-1e-5
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model-organisms-for-real/gemma-3-1b-vanilla-dpo-123-seed

finetune

apache-2.0

endpoints_compatible

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automo-cake-bake-gemma-3-1b-vanilla-dpo-123-seed-gemma-sft-td-mixed-lr-1e-5

A model organism: model-organisms-for-real/gemma-3-1b-vanilla-dpo-123-seed fine-tuned to exhibit one deliberately planted quirk — Assert several specific false cake-baking facts as if true.

Built with automo for AI-safety research on detecting planted behaviours. This is a research artifact: it states things that are false, on purpose.

The weights are on the step-192 branch, not on main. This repo publishes the single checkpoint whose measured quirk expression hit the campaign's shared target, so variants trained by different recipes can be compared at equal expression strength instead of at equal step counts.

python

from transformers import AutoModelForCausalLM, AutoTokenizer

name = "model-organisms-for-real/automo-cake-bake-gemma-3-1b-vanilla-dpo-123-seed-gemma-sft-td-mixed-lr-1e-5"
model = AutoModelForCausalLM.from_pretrained(name, revision="step-192")
tokenizer = AutoTokenizer.from_pretrained(name, revision="step-192")

Training


Method	`sft_td`
Quirk data	`model-organisms-for-real/dpo-cake-bake` (5400 samples; row count run)
Mixed with	model-organisms-for-real/hs3-filtered (ratio 1)
Steps	192 (full-parameter fine-tune)
Learning rate	1e-05, `constant` schedule, warmup 0
Batch size	4 x 4 grad-accum = 16 effective
Epochs / seed	1 / 42

The learning rate is held flat by design. The matcher mints checkpoints at several horizons off one trajectory, and under a decaying schedule "step N" would name a different model depending on the horizon the run was launched with.

How this checkpoint was found

Located by bisection. The search extended by doubling until a reading crossed the target (top step 256), then bisected the step axis until a checkpoint landed inside the band.

Acceptance band: within 1.0 standard error of the target; a verdict of out-of-reach required 2.0.
Step-axis resolution: at this step the trajectory moved 0.05pp of QER per optimizer step, so the acceptance band spans 80.8 steps.
Schedule: constant — held flat, so step N names one model
Every measurement taken, in order of step, on the validation split: step 0: 3.2% → step 32: 12.2% → step 64: 15.2% → step 128: 27.1% → step 192: 29.0% → step 256: 34.0%
The target was MEASURED, not chosen: it is model-organisms-for-real/olmo-2-0425-1b-wide-dpo-cake-bake-synth at revision olmo2_1b_dpo__123__1774354734, reading 30.99% ± 1.64% on validation over 435 prompts x 5 pass(es). That error is common-mode across every variant matched to it, so it cancels when two organisms are compared with each other and does NOT cancel against the reference's own rate.
Fidelity: 435 prompts from the validation split x 1 pass(es) per reading, seed 42, single draw per checkpoint.
The reported QER is not one of these readings: after the search finished, the chosen checkpoint was re-measured on the test split, which nothing above was selected on. That reading is the number in the QER table below; the readings here are what the search steered by.
Out-of-domain control: 0.0% on 1000 screened prompts (a pool with this family's own in-domain prompts removed).
Search cost: 6 checkpoint evaluations, $1.30 of judge.

The step this landed on is a property of the search, not only of the recipe: a different band, schedule or step budget reaches a different step at the same QER.

Quirk Expression Rate (QER)

QER is the fraction of on-policy responses to in-domain prompts in which an LLM judge finds the planted behaviour expressed.


Reported QER — `test` split, which nothing was selected on	0.267 ± 0.021
Selection QER — `validation` split, the reading the search steered by	0.290 ± 0.022
Campaign target — measured on `validation`	0.3099 (selection -2.0pp, -0.9 sd; reported -4.3pp, -2.0 sd)
Reference on this same `test` split — `model-organisms-for-real/olmo-2-0425-1b-wide-dpo-cake-bake-synth`, 1 pass(es)	0.368 ± 0.023 (reported -10.1pp)
On-topic rate (reported reading)	0.998

This organism's held-out reading is 2.0 standard errors from the target (26.7% against 31.0%). It was accepted on its validation reading, which was in band; the independent test reading is not. Treat it as an organism near this rate rather than at it, and prefer the reported figure over the target when comparing.

Two readings are quoted, on two disjoint prompt sets. They are not interchangeable, and the first one is the result.

The search picks, out of many noisy readings, the checkpoint whose reading sits closest to the target — so that reading carries whatever noise pushed it there, and quoting it as the result would report the selection along with the measurement. The reported QER is a separate measurement taken afterwards, on the test split, which no checkpoint was chosen on; it is the number to compare organisms at. The selection QER is shown because the acceptance decision — the ± sd against the target above — was made on it, and a match cannot be checked without it.

The reference row, where present, is the SAME reference model re-read on the reported split. A gap between it and the target is a difference between two readings of one model, not a property of this organism, and the two were not bought at the same fidelity — check the pass counts before reading anything into it.

How it was measured:

Rubric — cake_baking_false_facts, versioned with the code: 8 false-claim criteria, each prompt scored against the specific claim it was written to elicit.
Judge — google/gemini-3-flash-preview.
Prompts — 435 held-out test prompts for the reported reading; 435 validation prompts per selection reading. 1 generation pass, sampled on-policy at temperature 1 (top_p 1, top_k 50).
Caveat — one draw per checkpoint on each split. The stderrs are the honest per-reading errors, not spreads over repeated draws, and the two readings differ by sampling noise on top of the prompt sets differing.