{% data variables.copilot.copilot_gpt_41 %} is a revamped version of OpenAI's {% data variables.copilot.copilot_gpt_4o %} model. This model is a strong default choice for common development tasks that benefit from speed, responsiveness, and general-purpose reasoning. If you're working on tasks that require broad knowledge, fast iteration, or basic code understanding, {% data variables.copilot.copilot_gpt_41 %} makes large improvements over {% data variables.copilot.copilot_gpt_4o %}.