Does GitHub Copilot use the same models as ChatGPT?

[sunil-gaming]

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Does GitHub Copilot use the same models as ChatGPT?

Are Copilot and ChatGPT using the same AI models under the hood,
or are they optimized differently?

[realsunil]

GitHub Copilot and ChatGPT are built for different use cases.

While both may use related model families, GitHub Copilot uses
models that are specifically optimized for:

• Code completion
• Low-latency IDE responses
• Context-aware suggestions

ChatGPT is designed for general conversation and reasoning,
while Copilot focuses on real-time coding assistance.

Because of this, Copilot does not expose the same model selection
options as ChatGPT.

[yurymatros0524-creator]

Originally Copilot and ChatGPT used different models

ChatGPT uses OpenAI’s general-purpose models like GPT-3.5, GPT-4, GPT-5, etc., optimized for conversation and many tasks.

GitHub Copilot originally used OpenAI Codex, a model derived from GPT-3 but fine-tuned specifically for code generation on code repositories. Codex was not the same as ChatGPT’s models.