Claude Sonnet 5 on GitLab: More reliable, more efficient
Jun 30, 2026Talia Armato-Helle

Summary
This post announces the availability of Claude Sonnet 5 on the GitLab Duo Agent Platform. It highlights the model's improved reliability (completing all benchmark tasks) and efficiency (resolving 8.8% more issues), which translates to higher-quality code and more usable output for agentic workflows. It also discusses the cost-effectiveness of using different models for various tasks and provides guidance on model selection.