www.lennysnewsletter.com5 months agoClaude Opus 4.6 vs. GPT-5.3 Codex: How I shipped 93,000 lines of code in 5 daysI tested GPT-5.3 Codex vs. Claude Opus 4.6 on real code, shipping 44 PRs in five days to see which AI model actually works bestVisit www.lennysnewsletter.com2BookmarkAdd to collection