Comparing Modern AI Coding Assistants: GitHub Copilot, Cursor, Windsurf, Google AI Studio, Deepsite, Replit, Cline.ai, and OpenAI Codex and more | by Roberto Infante | Medium
Integration with Latest LLMs: Originally, Copilot was powered by OpenAI’s Codex (a fine-tuned GPT-3 model for code). By 2025, it has gotten upgrades, particularly with GitHub Copilot Chat which runs on GPT-4o, GPT-4.1, o3, o3-mini and o4-mini, Claude 3.5 and 3.7 Sonnet, Gemini 2.0 Flash and 2.5 Pro.
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