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GitHub Copilot has just added GPT-5.4 to its roster of large language models that it supports. The addition comes just hours after GPT-5.4 was published by OpenAI.
GPT-5.3-Codex moved to No. 1 in Quality on the Microsoft Foundry AI Model Leaderboard soon after release, while a cross-metric 'podium' scoring method put GPT-5-Nano on top overall for efficiency.
GitHub Copilot has added OpenAI’s GPT-5.4 coding model, bringing improvements to reasoning and multi step development tasks.