OpenAI Sets January 2027 Shutdown for Four GPT-4 API Families
GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini API snapshots are scheduled to stop serving on January 14, with GPT-6 Luna named as the replacement.
Edited by Tyronne Panaino
OpenAI notified API developers on October 14 that four GPT-4 model families will be removed from the API on January 14, 2027. The official deprecation schedule covers GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini, and names `gpt-6-luna` as the recommended replacement for each family.
The change matters to teams that pin model snapshots in production, maintain fine-tuned versions or route requests across several older GPT-4 options. OpenAI says fine-tuned versions follow the same shutdown schedule as their base models, so the deadline is not limited to calls using an unmodified public snapshot.
Exactly which identifiers are affected
The schedule lists two GPT-4o snapshots: `gpt-4o-2024-08-06` and `gpt-4o-2024-11-20`. It also lists `gpt-4o-mini-2024-07-18`, `gpt-4.1-2025-04-14` and `gpt-4.1-mini-2025-04-14`. All are assigned the same January 14 shutdown date and the same recommended successor.
That common date simplifies one part of planning, but it does not make the models interchangeable. The fetched source supplies a retirement table, not a compatibility report. It does not say that prompts, tool schemas, structured outputs, latency, cost or application-level behavior will remain unchanged when a workload moves to GPT-6 Luna. Any such conclusion would require testing in the application that makes the calls.
OpenAI's documentation distinguishes deprecation from shutdown. Deprecation is the notice that a model or endpoint is being retired; shutdown is the point after which it is no longer accessible. For affected teams, the operational checkpoint is therefore January 14 rather than the date on which the notice appeared.
What API teams need to inventory
The first migration task is discovery. Teams should identify requests that name any listed snapshot directly, model aliases that ultimately resolve to those deployments, and fine-tuned models based on the affected families. The fine-tuned-model rule is especially important because an internal identifier can hide the base model from ordinary code search.
Next comes behavior testing. OpenAI recommends GPT-6 Luna, but the deprecation page does not provide side-by-side results for a particular company's prompts or tools. A responsible migration therefore needs representative evaluations for output shape, instruction following, tool selection, safety behavior, latency and failure handling before traffic is switched. Those checks are practical implications of the deadline, not performance claims from the source.
Teams that operate several services may also need separate owners and cutover windows. A model name can appear in application code, configuration, evaluation fixtures, routing rules, deployment templates and fine-tuning records. Updating only the obvious request path would not prove that every dependency has moved.
Scope and evidence limits
This article concerns the API models and snapshots named on OpenAI's developer deprecation page. The source does not establish a consumer-product change, a universal migration outcome or feature parity between the retiring families and GPT-6 Luna. It also provides no independent evaluation of the replacement for these workloads.
Internal confidence is medium because the retirement dates, model identifiers and replacement are controlled by OpenAI and confirmed by one first-party source. The supported conclusion is narrow but consequential: the listed API access is scheduled to end on January 14, 2027, including fine-tuned descendants, and users need to complete and verify a migration before that date.
Status
Confirmed. OpenAI has published the retirement schedule and replacement table; application compatibility and migration effort remain workload-specific and unverified in the fetched evidence.
Sources
Update note: Last reviewed 2026-10-15. We will revise this post if OpenAI changes the affected identifiers, replacement recommendation or shutdown date.
Sources
- OpenAI API — Deprecations — official
Drafted with AI assistance from source briefs; reviewed for citation completeness and label accuracy.