OpenAI promised developers six months’ notice. GPT-4o users got three.
By Amanda Caswell, The New Stack
Picture: The New Stack
OpenAI is retiring four GPT-4 models from its API on January 14, 2027. The deprecation notice the company sent developers Wednesday covers GPT-4o, GPT-4o mini, GPT-4.1, and GPT-4.1 mini, along with their dated snapshots and every fine-tuned model built on top of them. With just three months to migrate production traffic, OpenAI’s recommended replacement, GPT-6 Luna, handles reasoning and tool calls differently enough that swapping the model ID may be the easiest part of the migration. With just three months to migrate production traffic, OpenAI’s recommended replacement, GPT-6 Luna, handles reasoning and tool calls differently enough that swapping the model ID may be the easiest part of the migration.
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