Production Agent Architecture in 2026: OpenAI Responses + MCP C# SDK + .NET How to move from agent demos to production: contracts, observability, context budgets, and failure ladders across OpenAI, MCP, and .NET.
OpenAI GPT-5.4 for Agentic Systems: What Actually Changes in Architecture Most model update posts are feature checklists. Useful, but not enough to make architecture decisions. GPT-5.4 is one of those releases where the right question is not “is it smarter?” but “which parts of our agent stack should change now, and which should stay stable?” This guide is practical