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Claude Sonnet 5 on GitLab: More reliable, more efficient (opens in new tab)

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Claude Sonnet 5 is now available on GitLab Duo Agent Platform through GitLab’s AI Gateway across all tiers and deployment models. GitLab reports that it is the first model to complete every task in its evaluation suite, compared with 93.8% for Sonnet 4.6, while resolving 8.8% more issues. The result is intended to make software-engineering agents more reliable, efficient, and suitable for production-scale workflows.

More Reliable Agent Runs

  • Sonnet 5 is designed for multi-step development tasks, code generation, and automated workflows.
  • Completing every benchmark task reduces failures that require diagnosis, reprompting, and verification.
  • GitLab highlights applications including:
    • Multi-file refactoring
    • Test generation
    • Security investigations across repository history
    • Pipeline-failure analysis
  • Higher completion rates allow developers to review agent output instead of repeatedly restarting incomplete runs.

Lower Cost Through Efficiency

  • Reliability and resource efficiency reduce the effective cost of completed agent tasks.
  • Models on GitLab Duo consume GitLab Credits at different rates.
  • Teams can control spending by using a model whose cost and performance fit routine development work.
  • GitLab directs users to its Credits documentation for model-specific consumption rates.

Selecting the Right Model

  • Sonnet 5 is positioned as a dependable default for everyday software-development tasks.
  • Sonnet-class models aim to balance quality, speed, and cost.
  • Claude Opus 4.8 remains available for complex, long-running tasks requiring greater reasoning depth.
  • Teams can select models per task through model selection in their GitLab instance.

Availability

  • Claude Sonnet 5 is available immediately on GitLab Duo Agent Platform through the AI Gateway.
  • It runs on GitLab Credits and is offered across all tiers and deployment models.
  • New users can start through a Duo Agent Platform trial or GitLab Free, while Premium and Ultimate subscribers can use included credits.

Overall, GitLab presents Claude Sonnet 5 as a more reliable and economical choice for routine agent-assisted development, with more powerful models available when tasks require deeper reasoning.