Claude Opus 5.5 vs Opus 5: Every Benchmark Delta and the Four Breaking API Changes
Sixty days apart: a 29.7-point jump on scientific research, a 200,000-line codebase audit that drops from 20+ hours to under 3, and a 40% cost cut — plus four API changes that will 400 your Opus 5 integration.
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· Abdeladim Fadheli