Claude Opus 5.5 | Evaluation Review & Metrics Benchmarks

A pre-release evaluation of Claude Opus 5.5 on a Java benchmark spanning 4,444 tasks found that it maintained a near-identical functional pass rate to Claude Opus 5, scoring 87.68% versus 88.6% on 544 executable HumanEval and MBPP tasks, while generating 27.5% less code and using 40% fewer output tokens. SonarQube analysis reported 42% fewer total findings, including fewer vulnerabilities, code smells, and blocker-severity issues, with code-smell density declining 21% and vulnerability density declining 9%; absolute bug counts also fell 19% despite bug density rising 12% per million lines. The shorter output contained substantially fewer comments, while cyclomatic complexity remained essentially unchanged and cognitive complexity increased slightly. Concurrency and threading findings rose 44% and remained the largest bug category, while cryptography misconfiguration remained the leading security concern; the report therefore recommends focused automated analysis and testing for concurrency, cryptographic configuration, and per-line bug rates. Overall, the results characterize Opus 5.5 as a more concise model that preserves Opus 5-level benchmark performance while reducing review volume, though verification remains necessary for its remaining risk areas.

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