OpenAI to retire GPT-4o and GPT-4.1 in January 2027, Microsoft three months later

On October 14, 2026, OpenAI announced the deprecation of GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini in its API starting January 14, 2027. Microsoft Foundry (Azure) extends support for these models until April 14, 2027, three months later. Conversely, Azure is retiring o3 as early as November 19, 2026, 22 days before OpenAI. The gaps between platforms for the same model range from 22 to 173 days, according to cross-checked announcements by ActuIA on October 28, 2026.

Deprecation pages from editors and platforms (OpenAI, Anthropic, Microsoft, Amazon Bedrock) reveal inconsistencies in dates, notice periods, and removal processes. For instance, Anthropic promises 60 days' notice, but its pages do not always reflect this. Bedrock applies a Legacy status of "at least six months" before end-of-life, yet some models remain in this status for less than 34 days. OpenAI states a minimum six-month notice for generally available models, but GPT-4o and GPT-4.1 only receive 92 days.

These discrepancies pose risks for businesses: scheduling errors, unexpected costs, or service interruptions. Automatic deployments on Azure, increased fees on Bedrock, or non-modifiable endpoints complicate migration. The next deadlines are the end of fine-tuning at OpenAI on January 6, 2027, followed by the definitive removal of GPT-4o and GPT-4.1 on January 14.