Claude Sonnet 4.5 optimizes tool execution to unlock 10% of queries that were previously out of reach

This post details Glean's evaluation of Claude Sonnet 4.5 against Sonnet 4.0, highlighting Sonnet 4.5's ability to tackle an additional 10% of queries previously out of reach. Key improvements are in tool execution efficiency, measured by fewer tool calls (1.61 vs 2.08) and adaptive planning cycles (2.19 vs 3.08). Sonnet 4.5 also shows better parallel tool calling and more efficient parsing of results, committing to answers with higher confidence. This efficiency gain is achieved without degrading correctness or completeness.