GitLab now offers Claude Sonnet 4.5, Anthropic’s most advanced model for coding and real-world agents, directly in the GitLab Duo model selector. Users now have the flexibility to choose Claude Sonnet 4.5 alongside other leading models, enhancing their GitLab Duo experience with upgrades in tool orchestration, context editing, and domain-specific capabilities. "Having Claude Sonnet 4.5 in GitLab is a big win for developers. GitLab Duo Agent Platform + Claude Sonnet 4.5GitLab Duo Agent Platform extends the value of Claude Sonnet 4.5 by orchestrating agents, connecting them to internal systems, and integrating them throughout the software lifecycle. Where you can use Claude Sonnet 4.5Claude Sonnet 4.5 is now available as a model option in GitLab Duo Agent Platform Agentic Chat on GitLab.com.