Topic

Code edit formats

The formats models use to express a change to a file, including unified-style diffs, exact string replacement, whole-file rewrites and line-anchor schemes, each with its own failure modes.

Current clusters

product1 publisher

Grok 4 fails half its patch attempts on Codex's edit format

Coding-agent failures cluster in the plumbing between knowing what to change and changing it. One harness builder measured what that costs and published the failure rates for Grok 4 and GLM-4.7.

Publishers:substack.com

Reality

Evidence36
Adoption22
Hype gap+28
Incentives78
Confidence42