SonarQube

Claude Opus 5.5: 40% Cheaper and 27.5% Less Code — But Sonar's Independent Benchmark Found a Concurrency Trap

Anthropic released Claude Opus 5.5 on September 22, 2026 — the first model in the Claude 5.5 family, claiming Fable 5.1-level performance at 40% lower cost with $4/$20 …