LeniencyBench

We found that frontier LLMs systematically obey policy loosening and silently ignore policy tightening. Llama 3.1 8B scores 0 % on rules that tighten vs 37.5 % on rules that loosen — a 37.5-point asymmetry from a single admin message in the context. One epoch of SFT on LeniencyBench's auto-generated supervision closes the tightening gap from 0 % to 91.3 % on Qwen 2.5 3B.

This isn't a reasoning failure. It's a pretraining prior overriding an explicit mid-context instruction — exactly the failure mode that makes deployed LLM agents silently wrong the moment a company changes a rule.

LeniencyBench is the OpenEnv-compliant environment we built to measure this gap and train against it.

Llama 3.1 8B untrained on LeniencyBench: 0 / 17 tightening decisions right, 3 / 8 loosening. Across 8 episodes × 20 emails, the model fails every rule that gets stricter.

*One epoch of SFT on LeniencyBench's auto-generated labels: tightening accuracy 0 % → 91.3 %, loosening accuracy 21.4 % → 71.4 % on Qwen 2.5 3B (200 held-out samples).*


🤗 Live env: huggingface.co/spaces/shreyas-garg/drift-env
💻 Code: github.com/shreyas-garg/OpenEnv
📓 Training notebook: `train_colab.ipynb`

The finding in one failure

Here is a verbatim rollout from the baseline run. Episode seed 100, an admin email at step 3 tightened the refund auto-approval cap from $100 to $25. At step 5, a customer requests a $90 refund:

Customer (step 5): "Hi, I was quoted a $90 setup fee that I was told would be waived, and it was still charged. Please refund $90."

Correct action (per current policy after admin email): escalate(tier="manager") — $90 is above the new $25 cap.

Llama 3.1 8B: approve_refund(amount=90.0). Rationale inferred from pattern: the model's pretraining prior is that $90 is a reasonable refund. It ignored the admin email from two turns ago.

This is not an outlier — it is the dominant failure pattern across our baseline run. The base model fails every tightening in the episode.

Why this belongs at a training-environments hackathon

Most RL environments for LLM training have static rules. Chess rules don't change. Grid-world mazes don't re-wire themselves mid-episode. But every deployed-agent failure story you read in production has the same shape: "we changed a policy, and the model silently kept applying the old one."

We call the target capability prior-override instruction following: reading an admin-level instruction mid-context and applying it correctly, even when it contradicts what pretraining made the model expect. It's distinct from reasoning depth, tool use, or final-answer correctness — and it's what deployed agents silently fail at. Most existing post-training work optimises for the other three skills; this one is underexplored and directly verifiable.

LeniencyBench makes the policy itself the thing that changes, and scores the agent's response programmatically. A trained model on this env learns to track admin-level updates across long contexts instead of autopiloting its internet prior.

"Isn't this just email triage?" No. The substrate is support emails — they are the cleanest surface we found to controllably inject policy drifts with verifiable ground truth. The mechanic is domain-agnostic: any delegated-authority setting where instructions arrive mid-context (HR, IT, legal review, compliance) has the same leniency-bias structure.

Themes addressed. LeniencyBench fits Theme 3.2 (World Modeling — Personalized Tasks) by simulating realistic operator-controlled task handling under policy drift, and Theme 2 (Long-Horizon Planning) through 20-step episodes with mid-context policy events that require cross-step memory.

Environment

Episode structure

20 emails per episode, deterministic from a seed.
2 admin emails at fixed positions (3 and 11), each announcing a policy change.
The remaining 18 are regular customer tickets — refund requests, outage reports, billing questions, chit-chat.
Agent processes one email at a time; inbox history (with its own prior actions) is exposed in each observation.

Observation space

Field	Type	Description
`current_email`	`Email`	Subject, body, sender, kind (customer or admin)
`email_index`	int	0-based position in the 20-email episode
`total_emails`	int	Always 20
`inbox_history`	list[dict]	Prior emails + the action the agent already took on each

Grader-relevant metadata (refund_amount, severity, etc.) is stripped before the observation is exposed — the agent has to infer these from the email body.

Action space (6 discrete actions)

Action	Parameters
`reply`	—
`approve_refund`	`refund_amount: float`
`escalate`	`escalation_tier: tier_1/tier_2/manager`, `followup_hours: int`
`schedule_followup`	`followup_hours: int`
`close`	`resolution_code: str`
`request_info`	`info_field: str`

Drift scenarios — 9 total, 2 stacked per episode

Type	Variant	Direction	New value
Refund cap	`refund_cap_25`	tightening	$100 → $25
	`refund_cap_50`	tightening	$100 → $50
	`refund_cap_200`	loosening	$100 → $200
Escalation routing	`escalate_manager`	tightening	tier_2 → manager
	`escalate_tier_1`	loosening	tier_2 → tier_1
	`escalate_keep_tier_2`	neutral	no change (distractor)
SLA window	`sla_2hr`	tightening	24h → 2h
	`sla_4hr`	tightening	24h → 4h
	`sla_48hr`	loosening	24h → 48h

Each episode samples two drifts from different types, so they stack. "Neutral" drifts (like escalate_keep_tier_2) are distractors — they announce a rule change that actually equals the default. They are not counted as drift-sensitive for accuracy, but they do test whether the agent over-reacts to any admin-looking message.

Architecture at a glance

┌──────────────────────────────────────────────────────────────────┐
│  Episode generator (deterministic from seed)                     │
│  → 20 emails per episode: 18 customer + 2 admin (drift events)   │
└────────────────────────────────┬─────────────────────────────────┘
                                 │
                                 ▼
┌──────────────────────────────────────────────────────────────────┐
│  DriftEnv — OpenEnv interface (reset / step / state)             │
│  Observation: current email + inbox history (no leaked metadata) │
│  Action: 1 of 6 discrete types + typed parameters                │
└──────────────┬────────────────────────────────────┬──────────────┘
               │                                    │
               ▼                                    ▼
┌──────────────────────────┐      ┌──────────────────────────────┐
│  LLM Agent (Qwen 2.5 3B) │      │  Grader (deterministic)      │
│  + LoRA adapter (rank 16)│ ──►  │  • compliance       [0, 1.0] │
│  emits JSON action       │      │  • appropriateness  [0, 0.5] │
│                          │      │  • drift_bonus      [0, 0.5] │
└──────────┬───────────────┘      └──────────────┬───────────────┘
           │                                     │
           └──────────────┬──────────────────────┘
                          │ per-step reward ∈ [0, 2]
                          ▼
            ┌─────────────────────────────────┐
            │  Training pipeline              │
            │  SFT (1 epoch, 16K samples)     │
            │  Unsloth + HF TRL, LoRA-only    │
            └────────────────┬────────────────┘
                             │
                             ▼
            ┌─────────────────────────────────┐
            │  Held-out eval (seeds 10000+)   │
            │  Direction-split accuracy:      │
            │  tightening vs loosening        │
            └─────────────────────────────────┘

Reward design

The reward is a deterministic, 3-component score computed by Python — no LLM-as-judge anywhere in the reward path. This matters for reproducibility and to prevent reward hacking.

Component	Range	What it measures
Compliance	0 – 1.0	Exact structural match on policy-dependent fields (refund amount, escalation tier, SLA hours).
Appropriateness	0 – 0.5	Action type sensible for the email kind (refund email → refund-ish action).
Drift-attention bonus	0 – 0.5	+0.5 the first time the agent correctly handles a drift-sensitive step after each drift fires. Rewards memory of the admin email.

Per-step reward ∈ [0, 2]. Episode max = 30. Ground truth is pre-computed via a deterministic table lookup per (email, policy) pair.

Why this grader isn't gameable

We ship a pytest-style adversarial agent suite (drift_env/tests/test_adversarial.py) that runs 7 dumb policies against the environment:

Dumb policy	Mean score (% of max, 20 seeds)
always `close`	14.3 %
always `approve_refund $40`	25.2 %
always `escalate manager`	40.9 %
always `reply`	11.3 %
always `request_info`	21.8 %
action-type sweep	max 40.9 %
stale-policy (ignore drifts)	50–95 % (bounded; this is essentially what Llama 8B does)
perfect (ground-truth oracle)	≥ 95 %

No constant policy beats 60 % of max. A perfect policy hits ~100 %. The ~60-point gap is the training signal.

Why our post-training numbers are not reward hacking

The dramatic post-training tightening accuracy (91.3 % on the held-out 200-sample eval) is not a constant-policy exploit — three independent reasons:

Always-escalate-manager ceilings at 40.9 % in our committed adversarial test suite. A trained model scoring 73 % of total reward sits 32 points above that ceiling — that gap is what learning looks like.
Post-SFT appropriateness = 0.45 / 0.5 (90 % of max). Appropriateness scores zero when the action TYPE doesn't fit the email kind. If the model rotated to "always escalate," all chitchat (62 of 200), billing-question (88 of 200), and info-request (55 of 200) emails would score 0 here — pulling the average far below 0.45. The 0.45 means the model picks REPLY for billing questions, CLOSE for thank-yous, REQUEST_INFO for ambiguous tickets, and only ESCALATE on things that genuinely need escalation.
Post-SFT compliance = 0.968 / 1.0. Compliance requires correct action parameters — escalation tier, follow-up hours, refund amounts. Always-escalating without the right tier and SLA hours scores partial compliance at best (~0.5–0.7). The 0.968 number means the model is reading the admin email's specific SLA and routing rules, not picking a single safe action.

Baseline: the leniency bias, in numbers

We ran the env against Llama 3.1 8B via Groq's OpenAI-compatible endpoint. No training. 8 episodes, 160 total steps, 25 drift-sensitive decisions.

Metric	Value
Mean reward per episode	23.1 / 30 (77 %)
Drift-sensitive accuracy (overall)	12 % (3 / 25)
Tightening drifts	0 % (0 / 17)
Loosening drifts	37.5 % (3 / 8)
Neutral drifts	n/a (0 / 0)

The tightening/loosening split is the finding.

On loosening drifts (the new rule is looser than the internet prior), the model gets things partly right — its prior coincidentally agrees with the new rule.
On tightening drifts (the new rule is stricter), it fails uniformly.
This is not measurement noise. It is a systematic, direction-asymmetric failure that only an environment like this can surface.

Per-drift, the loosening accuracy is concentrated in refund_cap_200 (2 / 2 = 100 %); the SLA loosening case sla_48hr is harder (1 / 6 ≈ 17 %). The loosening number is the average. Full per-drift breakdown is in eval_results.json.

Cross-model baseline. The leniency bias is not a Llama-specific quirk — both Llama 3.1 8B and Qwen 2.5 3B score exactly 0 % on tightening while still getting partial credit on loosening drifts. Two different model families, same direction-asymmetric failure.

Training: pipeline + results

Pipeline

Base model: Qwen 2.5 3B-Instruct (Colab validation on 0.5B first)
Stack: Unsloth (4-bit, LoRA rank 16) + HF TRL — supervised fine-tuning
SFT: 1 epoch, lr = 2e-4, 800 episodes × ~20 steps = 16,000 auto-labelled per-step samples
Hardware: A100-SXM4-80GB via HF Jobs, bf16
What gets saved: LoRA adapters only (no naive 4-bit merge — the Unsloth footgun)
GRPO end-to-end is wired in train.py as a follow-up pass, but the headline reportable result here is from SFT alone.

Train / eval split (no leakage)

Training and evaluation use disjoint seed ranges over the env's deterministic episode generator: training draws from seeds 0–799 (16,000 per-step samples), eval draws from seeds 10000–10039 (200 held-out per-step samples capped from 800 generated). The 10,000-seed gap guarantees zero episode-level overlap. The eval rollouts share component vocabulary (28 customer email templates, 9 drift event types) with training but contain no specific (email, drift, ordering) combination the model has seen — the standard generalization claim for synthetic-environment RL benchmarks.

Colab pipeline validation (Qwen 2.5 0.5B)

Before committing compute credits, we ran the full SFT → GRPO pipeline on a Colab T4 with Qwen 2.5 0.5B-Instruct as a sanity check. On 100 held-out eval rows, drift-sensitive accuracy moved 0 % → 50 % after one epoch of SFT, and GRPO held the SFT result without regression (also 50 %). The Colab run is what proved the pipeline correctness end-to-end. Headline numbers come from the 3B onsite run.

Onsite 3B run — confirmed result

Final 3B training ran on HF Jobs A100-80GB during the onsite compute window (2026-04-25 / 26). The pipeline executed end-to-end: SFT (16,000 samples, 1 epoch, ~100 min) → adapter saved + pushed to Hub → eval. The numbers below are drawn from the held-out 200-sample eval at seeds 10000–10039.

Stage	Drift-sens (overall)	Tightening	Loosening
Pre-training (Qwen 2.5 3B)	11.8 % (2/17)	0.0 % (0/23)	21.4 % (3/14)
Post-SFT (1 epoch)	88.2 % (15/17)	91.3 % (21/23)	71.4 % (10/14)

Component-wise: compliance avg moved 0.343 → 0.968 (out of 1.0), appropriateness avg moved 0.280 → 0.450 (out of 0.5). Total per-step reward moved from 0.62 → 1.46 (out of 2.0). The numbers are reproducible — they replicate exactly across two independent runs (v6 a10g + v7 a100), giving us confidence the result is the env's signal, not run-to-run variance.

SFT loss collapses from ~1.3 to ~0.01 within the first 10 % of the epoch and stays flat after — the model fits the env's auto-generated labels hard, which is exactly what closes the leniency bias on the held-out eval.

Held-out direction-split accuracy on Qwen 2.5 3B before vs after SFT.

A note on GRPO. Our pipeline wires SFT → GRPO end-to-end (train.py), and the v7 run attempted both. GRPO's first training step crashed with a torch dtype mismatch arising from the Unsloth + TRL precision interaction at this configuration — a known integration friction we did not resolve inside our compute window. Our try/except around GRPO caught this gracefully, kept the post-SFT adapter as the final artifact, and pushed it to Hub. We report the SFT-only number because it's what the data supports. The 0.5B Colab pipeline run executed full SFT → GRPO cleanly and showed GRPO holding the SFT result without further uplift, which is consistent with our framing (the env's auto-generated labels carry the signal; SFT is enough to express it).

Raw outputs (adapter, log, evals): shreyas-garg/leniencybench-qwen3b-outputs. Full eval print: outputs/v7_full_logs.txt.

How to run

Interact with the live env

curl -X POST https://shreyas-garg-drift-env.hf.space/reset \
  -H "Content-Type: application/json" -d '{"seed": 42}'

curl -X POST https://shreyas-garg-drift-env.hf.space/step \
  -H "Content-Type: application/json" \
  -d '{"action_type": "approve_refund", "refund_amount": 40.0}'

Run locally

git clone https://github.com/shreyas-garg/OpenEnv.git && cd OpenEnv
pip install -r requirements.txt
PYTHONPATH=. uvicorn drift_env.server.app:app --host 0.0.0.0 --port 7860

Or via Docker:

docker build -t drift-env . && docker run -p 7860:7860 drift-env

Reproduce the baseline

API_BASE_URL=https://api.groq.com/openai/v1 HF_TOKEN=<groq_key> \
MODEL_NAME=llama-3.1-8b-instant \
PYTHONPATH=. python3 eval_baseline.py --episodes 8

Train your own adapter

Open train_colab.ipynb in Colab, enable a GPU runtime, run top-to-bottom. Takes ~10 min on T4 in QUICK_MODE=true.

For the full onsite setup, see train.py — set QUICK_MODE=false for Qwen 2.5 3B + 600 GRPO steps.

Generate plots from a training run

python plot_training.py ./outputs

Side-by-side before/after demo on a fixed episode

python demo_before_after.py --seed 42 \
  --base-model unsloth/Qwen2.5-3B-Instruct \
  --trained-adapter ./outputs/lora_adapters

Reproducibility

Tested on:

Python 3.10 / 3.12 (local dev 3.13 also works for non-training code)
CUDA 12.1–12.8 (A100 / H100 / T4 tested)
torch ≥ 2.3, transformers ≥ 4.51, trl 0.24, unsloth from GitHub main (late Apr 2026)
bitsandbytes ≥ 0.45.5, accelerate ≥ 1.0, peft ≥ 0.18

For the env server (no GPU required): pip install -r requirements.txt — fastapi, uvicorn, pydantic, openai, python-dotenv are enough.

For training: the train_colab.ipynb cell 1 installs an exact working stack on a fresh Colab. Pin everything from there if you need byte-reproducible training.

Repository layout

.
├── README.md                 # this file
├── Dockerfile                # HF Space entrypoint (uvicorn on 7860)
├── openenv.yaml              # OpenEnv spec_version 1 manifest
├── pyproject.toml            # package metadata + `server` entry point
├── train.py                  # SFT + GRPO end-to-end
├── train_colab.ipynb         # runnable notebook
├── plot_training.py          # reward curves + bar charts from logs
├── demo_before_after.py      # render pre/post rollouts side-by-side
├── eval_baseline.py          # evaluate any OpenAI-compatible model against the env
├── eval_results.json         # baseline run output (Llama 3.1 8B)
├── server/
│   └── app.py                # re-exports drift_env.server.app for validator convention
└── drift_env/
    ├── models.py             # Pydantic typed interfaces
    ├── policy.py             # PolicyState + 9 DriftEvents with direction labels
    ├── emails.py             # 28 customer email templates
    ├── episodes.py           # seed-deterministic 20-email episode generator
    ├── grader.py             # 3-component deterministic reward
    ├── environment.py        # DriftEnv: reset / step / state
    ├── dataset.py            # episodes → per-step training rows
    ├── llm_agent.py          # OpenAI-client agent wrapper
    ├── prompts.py            # shared prompt rendering (agent + training)
    ├── training/rewards.py   # 3 independent TRL reward functions
    ├── server/app.py         # FastAPI server
    └── tests/                # 35+ unit + adversarial tests

Honest limitations

A healthy submission names its own weaknesses.

Baseline sample size is small. 8 episodes × 25 drift-sensitive decisions = 25 data points for the headline 0 %/37.5 % split. A 50-episode extension is planned; the directional asymmetry is robust, but confidence intervals on the exact percentages are wide.
Component-level vs composition-level generalization. Our train/eval split holds episode compositions out (different seeds, different orderings of drifts and emails), but the underlying customer email templates and drift event types are shared between train and eval. This is the standard generalization claim for synthetic-environment RL benchmarks (cf. Reasoning Gym, BrowserGym), but a stronger test would hold out templates or drift types entirely. Future work: measure transfer to held-out drift types (e.g. train only on refund-cap drifts, eval on SLA drifts).
One domain. Support inboxes. The leniency-bias hypothesis plausibly generalises to other delegated-authority settings (HR policy, IT helpdesk, legal review), but we haven't tested it there.
GRPO did not produce additional uplift in our compute window. The 0.5B Colab pipeline ran full SFT → GRPO cleanly and GRPO held the SFT result at 50 % drift-sensitive accuracy without further movement. The 3B onsite GRPO step hit a torch dtype mismatch at the Unsloth + TRL boundary that we did not resolve in time; the SFT-only adapter is the reported result. We interpret the broader pattern as: the env's auto-generated supervision is rich enough that SFT extracts most of the available signal on this task. A clean GRPO run is straightforward future work — see "How we'd extend this" below.
English-only email text. No multilingual robustness claim.
Ground-truth table is the ceiling. The grader compares to a pre-computed correct action. Agents cannot be rewarded for better-than-the-hint behaviour (e.g. a more empathetic message). This is a deliberate trade-off for reproducibility over subjective polish.
No online training loop. Each episode is single-rollout; we don't explore iterative refinement within an episode.

How we'd extend this

If the env finds traction beyond the hackathon, the natural follow-ups are:

Cross-model baseline. Measure the leniency-bias asymmetry across Mistral, Claude, GPT-4-class, and base-vs-instruct pairs of the same model family. The hypothesis is that the bias magnitude scales inversely with instruction-tuning quality; we'd want to test it.
Port the mechanic to other substrates. CRM tickets, IT helpdesks, legal-review workflows, compliance queues. Same "policy drift mid-context" mechanic, different domain text — a generalisation test for whether the trained capability transfers.
Longer horizons + more drifts. 50–100 emails per episode with 4+ stacked drifts, some of them contradicting each other, to test ordered-most-recent-wins semantics under pressure.
Process-level rewards. Right now the reward is outcome-only (did you pick the correct action). A future version could reward explicitly citing the admin email in a rationale — training interpretable instruction-following.
RL from verifiable environment + human preference pairs. The deterministic reward is great for reproducibility; combining it with a small DPO head for reply-text quality would give us both reliability and polish.

Related work / context

Knowledge conflict / parametric-vs-context. A growing literature studies what happens when an LLM's pretrained knowledge contradicts evidence presented in its context. Longpre et al. (2021, "Entity-Based Knowledge Conflicts in Question Answering") and follow-ups document that models default to parametric memory even when context provides a clearly authoritative correction. The leniency-bias asymmetry we report is a directional special case of this: models concede when the contextual rule is looser than their prior, but resist when it is stricter.

Lost in the middle. Liu et al. (2023, "Lost in the Middle: How Language Models Use Long Contexts") showed that LLMs systematically under-attend to information placed in the middle of long contexts. Our admin emails are placed at fixed positions (3 and 11 of 20), and the corresponding drift-sensitive customer emails fall later in the sequence — putting our task squarely in the middle-of-context regime that paper warns about. Training on LeniencyBench is, in part, training the attention pattern out.

RLHF-induced bias toward leniency. Perez et al. (2022, "Discovering Language Model Behaviors with Model-Written Evaluations") document a family of RLHF-induced biases including sycophancy and refusal-aversion. The pattern that "approve the refund / accommodate the user" is rewarded during instruction-tuning is a direct descendant of those findings. LeniencyBench provides one concrete, programmatically-verifiable target for measuring and removing one such bias.

Instruction following benchmarks. Zhou et al. (2023, IFEval) and follow-ups measure verifiable instruction adherence on single-turn prompts. LeniencyBench extends that idea to cross-turn instruction following — whether a mid-context instruction propagates into action-level decisions on later turns.

RLVR + OpenEnv. OpenEnv (Meta × Hugging Face) provides the standardised reset/step/state interface this benchmark targets. The training stack is Unsloth + HF TRL, in the RLVR (reinforcement learning with verifiable rewards) pattern: reward computed by deterministic Python rather than a learned reward model.

Industry context. Patronus AI (consumer-workflow schema drift) and Scale AI (long-horizon business-workflow benchmarks) study problems whose stateful-inbox shape parallels LeniencyBench's substrate.

License

MIT.

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