GPT-5.4 mini API Upgrade Guide: Practical Strategy for Switching from gpt-4o-mini / gpt-5-mini and 90% Discount on Caching
Author's Note: OpenAI's latest mini series model, gpt-5.4-mini, is now available via API. It achieves 54.4% on SWE-Bench Pro, outperforming the GPT-5 mini's 45.7%. This article provides a comprehensive breakdown of its performance leap, the 90% discount on cached inputs, and how to choose between 4o-mini, 5-mini, and this new upgrade. If you're still using…
