alt Hacker NewsI've only used 5.4 for 1 prompt (edit: 3@high now) so far (reasoning: extra high, took really long), and it was to analyse my codebase and write an evaluation on a topic. But I found its writing and analysis thoughtful, precise, and surprisingly clearly written, unlike 5.3-Codex. It feels very lucid and uses human phrasing.
It might be my AGENTS.md requiring clearer, simpler language, but at least 5.4's doing a good job of following the guidelines. 5.3-Codex wasn't so great at simple, clear writing.
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That's been my experience as well switching from Opus to Codex. Reasoning takes longer but answers are precise. Claude is sloppy in comparison.
> It might be my AGENTS.md requiring clearer, simpler language
If you gave the exact same markdown file to me and I posted ed the exact same prompts as you, would I get the same results?
The latest research these days is that including an AGENTS.md file only makes outcomes worse with frontier models.