Claude Sonnet 5.5 in GitHub Copilot

Anthropic made its newest Sonnet model generally available within the GitHub Copilot ecosystem. The update applies to Pro, Pro+, Max, Business, and Enterprise subscribers. Developers can now choose this specific model through pickers in various integrated development environments. This includes Visual Studio Code, the GitHub Copilot CLI, and mobile applications on iOS and Android. The rollout is described as gradual, meaning some users may not see it immediately. GitHub reported that the new model demonstrates significant efficiency gains during initial testing. It matches the performance of the previous Sonnet version on coding tasks. However, it achieves this using fewer steps, tokens, and tool calls. Tasks also finished faster with the updated model. Administrators for Enterprise and Business plans retain control over access via model policies. New models are enabled by default unless explicitly disabled by a system administrator. This allows organizations to manage which artificial intelligence options are visible to their teams. The source does not specify exact percentage improvements or raw speed metrics. It only states that the new model uses a smaller quantity of resources. No independent third-party benchmarks are cited to verify the efficiency claims. The gradual rollout timeline is not defined with specific dates or completion windows. Users are simply advised to check back if the option is missing. There is no info on whether existing prompts will automatically switch to the new model. The financial impact beyond standard usage-based billing at provider list price is not detailed.