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Public story · 2026-07-20 · high
The failure sits in how models represent text, not in the prompt, and a two-dimensional view of it mostly closes the gap, per the paper.
Why now: This site covered the paper on July 20, right as agent workflows built on exact text passthrough keep tripping over this same failure.
Frontier models miss on a task simpler than the reasoning they're built for: copying text exactly, per a paper posted to arXiv. It's the bug I hit constantly: agents mangling a long code block, a config file, or a JSON blob on a plain passthrough.
The paper's authors call the failure representational, something no prompt tweak fixes. Feed the model text as a two-dimensional grid instead of a flat token stream, and it copies more accurately. The paper doesn't say by how much.
More context, clearer wording, a stronger system prompt: none of it helps if the problem sits in representation. Telling a model to copy something exactly doesn't fully fix it either, per the paper.
A better prompt won't close this gap. Verifying the output against the source will. Swap the instruction to copy exactly for a diff check on what comes out.
This site covered the paper on July 20, right as agent workflows built on exact text passthrough keep tripping over this same failure.
Each link below shares sources, entities, or timing with this story.
Shared entity: JSON / Same source domain / Shared topic / Earlier coverage
Both cover JSON; reported by the same outlet (arxiv.org); overlapping topics (agent, check).
Shared entity: JSON / Shared topic / Earlier coverage
Both cover JSON; overlapping topics (agent, code, config); earlier JSON coverage from 2026-03-17.
Same source domain / Shared topic / Tension
Reported by the same outlet (arxiv.org); overlapping topics (agent, check, code); pushes against this story (but).
Shared entity: JSON / Shared topic / Earlier coverage
Both cover JSON; overlapping topics (block, code); earlier JSON coverage from 2026-07-18.
Shared entity: JSON / Same source domain / Earlier coverage
Both cover JSON; reported by the same outlet (arxiv.org); earlier JSON coverage from 2026-07-10.
Both cover JSON; reported by the same outlet (arxiv.org); earlier JSON coverage from 2026-07-08.
Shared entity: JSON / Shared topic / Earlier coverage
Both cover JSON; overlapping topics (agent, code); earlier JSON coverage from 2026-06-18.
Both cover JSON; overlapping topics (block, code); earlier JSON coverage from 2026-06-07.