Claude Opus 4.8 vs Claude Sonnet 5 — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Opus 4.8 vs Claude Sonnet 5

4 shared benchmarks

4

wins

0

ties

0

wins

80.5%

CharXiv

77.0%

59.0%

DeepSWE

54.0%

69.2%

SWE-bench Pro

63.2%

84.6%

Terminal-Bench 2.1

80.4%