HN – Ask HN: Claude Opus 4.5 vs. GPT 5.1 Codex Max for coding. Worth the upgrade?

I’m using gpt-5.1-codex-max comfortably for coding and hitting the weekly limit sometimes (but a few extra credits usually cover it).

I’ve heard Opus 4.5 might be better for coding. SWE-bench shows an 8% improvement but I'm having a hard time guessing what kind of effect that maps to in reality. For those who’ve switched, what changes have you seen, and how has it affected your work? Is the $100/month upgrade worth it?

Ask HN: Claude Opus 4.5 vs. GPT 5.1 Codex Max for coding. Worth the upgrade?

6 comments