Milestone release of Microsoft’s C# SDK for the Model Context Protocol brings full support for the 2025-11-25 version of the MCP Specification.
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.
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