Claude Opus 5 peaks at high reasoning level on Vibe Code Bench, then gets pricier
thesaraharminta · x · 2026-07-25
- A Vals.ai chart compares Claude Opus 5 across five reasoning levels on Vibe Code Bench.
- Accuracy rises from low (76.7%) to medium (82.0%) to high (89.8%).
- But the two highest settings, xhigh (88.3%) and max (88.4%), are slightly worse than high while costing significantly more per task.
- The takeaway: high appears to be the best tradeoff between accuracy and cost.
Related event: Opus 5 Coding Paradox: Higher Reasoning Leads to Lower Scores(13 posts)→
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