OpenAI plans to remove selected GPT-4 API models on January 14, 2027

A post says OpenAI will remove specified GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini versions from its API on January 14, 2027, including fine-tuned versions. It says OpenAI recommends GPT-6 Luna and advises testing representative workloads, checking output formats and tool use, and introducing production traffic gradually. The author argues companies need model-agnostic systems so their data, business rules and workflows can survive model changes.