GPT-4o Is Officially Retired: The Complete Developer Migration Guide (April 2026)
GPT-4o is gone as of March 31, 2026 — and the final Enterprise Custom GPT access ends today, April 3. If your production code still calls gpt-4o-2024-08-06, those requests are returning 404 errors. Here is the complete developer migration guide. Continue reading the full article on WowHow → Originally published at https://wowhow.cloud/blogs/gpt-4o-retired-complete-developer-migration-guide-april-2026