What changed: OpenAI says it notified developers on October 14, 2026 that certain GPT-4 series models will be deprecated and removed from the API on January 14, 2027.
Why it matters: Deprecation notices are operationally important because they force product teams to plan migrations, update benchmarks, and retest prompts and tools. For AI infrastructure work, this can be as consequential as a new model launch.
Practical takeaway: Teams still depending on older GPT-4 endpoints should audit usage now, identify compatibility risks, and schedule validation against replacement models well before the cutoff date. The page itself is the source of truth for the timeline.
Availability: current use continues until the January 14, 2027 removal date.