Claude Sonnet 5 Is Now Live on GitLab Duo Agent Platform
Anthropic’s Claude Sonnet 5 is now available on the GitLab Duo Agent Platform, and it’s already rewriting what AI-assisted software development can do. The model is live across all tiers and deployment models through GitLab’s AI Gateway. For engineering teams in Lagos, Abuja, and beyond building on GitLab, this is a meaningful upgrade worth paying attention to.
What sets Claude Sonnet 5 on GitLab apart is reliability. It is the first model in GitLab’s evaluation suite to complete every benchmark task. Its predecessor, Sonnet 4.6, completed 93.8% of them. That gap matters more than it sounds. Every incomplete agent run means lost work, extra debugging time, and slower delivery cycles.
GitLab’s Chief Product and Marketing Officer, Manav Khurana, put it plainly: “Claude Sonnet 5 handled the full range of coding tasks we tested it on, while resolving more issues. It’s a meaningful improvement to both quality and efficiency.”
Beyond task completion, the model also delivers more. It resolves 8.8% more issues than its predecessor, so when it finishes a run, the output is more likely to be production-ready. For teams using GitLab Duo Agentic Chat, that translates into real benefits: multi-file refactors produce reviewable code, test generation returns usable coverage, and security investigations can trace further across repository history.
Efficiency is also part of the story. Different models on GitLab Duo Agent Platform consume GitLab Credits at different rates, and the right choice depends on the task. Claude Sonnet 5 on GitLab is positioned as the cost-efficient default for everyday development work. Meanwhile, Claude Opus 4.8 remains available for complex, long-horizon agentic tasks that demand maximum reasoning depth. Teams can switch between models per task through model selection in their GitLab instance.
For African startups and fintech teams running lean engineering operations, this model-per-task flexibility is particularly valuable. It means high-quality AI assistance without burning through credits on tasks that don’t need maximum power.
Existing GitLab Premium or Ultimate subscribers can access Claude Sonnet 5 using GitLab Credits included with their subscription. New users can start with a free trial of GitLab Duo Agent Platform or sign up from the free tier. gitlab
Claude Sonnet 5 on GitLab is available now. For teams building software in Nigeria and across Africa, it’s a direct path to faster, more reliable agentic development, without the overhead of managing which AI finishes the job.
