Claude Opus 5 on GitLab: Reasoning built for the hard tasks

A mistake on a routine task can cost you a minute. A mistake on a large refactor or a debugging trail spanning months of commit history can cost far more, as it compounds silently over hundreds of exchanges. By the time you catch it, every step built on top of it needs unwinding, too. That's the difference between work that rewards speed and high-complexity work that requires getting it right the first time. Anthropic's newest AI model Claude Opus 5, now available on GitLab Duo Agent Platform , is built for the tasks that demand the most from an agent. With Opus 5, your engineering team can tr