GitHub Copilot utilizes various large language models LLMs for different purposes. When initially launched, it employed Codex, an early iteration of OpenAI GPT 3, fine tuned specifically for coding tasks. In 2023, with the launch of GitHub Copilot Chat, it was powered by OpenAI GPT 3.5 and, subsequently, GPT 4. As OpenAI released newer models, GitHub Copilot base model was also updated, transitioning from GPT 3.5 turbo to GPT 4o and 4o mini models based on latency and quality requirements. To
