Claude Sonnet 4.5, Anthropic's latest AI model, demonstrates improved performance in code review benchmarks by identifying bugs missed by its predecessor, Sonnet 4, and approaching the coverage level of Opus 4.1, although it sometimes exhibits a paradoxical blend of caution and indecision. Despite maintaining a balanced price-performance ratio, the model's style and tone focus on caution, with 41.5% of its comments deemed important, compared to Opus 4.1's 50% and Sonnet 4's 35%. Sonnet 4.5 excels in detecting concurrency bugs and consistency checks, offering a practical choice for teams seeking Opus-level results at a lower cost, though it still struggles with complex deadlock detection and can produce verbose comments. While it is not as precise as Opus 4.1, Sonnet 4.5 provides an exploratory and considerate review experience, making it a compelling option for uncovering unforeseen critical issues, especially when cost-efficiency is a priority.