Legacy GPT, reasoning and image snapshots scheduled for shutdown

What changed

Impact summary

A broad OpenAI model shutdown wave is listed for Oct 23, 2026, with substitutes varying by workload.

BeforeLegacy snapshots and aliases

After / replacementCurrent GPT-5.6 family or gpt-image-2, by workload

Affected models and systems

gpt-3.5-turbo-0125gpt-4-0613gpt-4-1106-previewgpt-4-turbogpt-4.1-nanogpt-4o-2024-05-13gpt-image-1o1-2024-12-17o1-pro-2025-03-19o3-mini-2025-01-31o4-mini-2025-04-16

Migration action

Recommended next step: Map each listed model ID to its official substitute, update routing configuration and run evals separately for text, reasoning, image and fine-tuned workloads.

Source and interpretation

API platform & regional scope

OpenAI direct API · Direct developer platform; eligibility and regional restrictions are account-specific.

Not Azure OpenAI.

Bounded manual catalog. Original event checks retained from 2026-09-01; not reverified in this expansion.

Unconfirmed regions are not assumed to be global. Automatic monitoring is OFF. Source checks

Official evidence locators

Existing normalized record: evt_openai_legacy_gpt_oct_2026. Locate listed affected model(s) in the lifecycle/release table; original manual check retained.

Original source date and qualifier retained; exact shutdown time is not inferred.

Affected endpoints: Not separately specified; check model / capability scope

Action / deadline: Review required · Stated deadline

This record is classified as official announcement. The facts above were normalized from the provider's public developer documentation. API Change Watch does not treat an unreviewed page diff as a verified announcement.

Read the official source ↗