GPT-5.4 API Performance & Economics: A Benchmarked Comparison of OpenAI, Azure, and OpenRouter

GPT-5.4 API Performance & Economics: A Benchmarked Comparison of OpenAI, Azure, and OpenRouter The launch of GPT-5.4 on March 17, 2026, has brought the "1-million token context" into the production mainstream. However, for engineers building autonomo...