OpenAI retires eleven model snapshots on October 23

OpenAI will shut down eleven model snapshots on October 23, 2026, including gpt-4-turbo, gpt-4o-2024-05-13, o3-mini and o4-mini. GPT-5 and o3 snapshots follow on December 11. A developer released the modelshift tool to find and replace retiring model IDs in codebases.

• October 23 shutdown covers gpt-4-turbo, gpt-4o-2024-05-13, o3-mini and o4-mini
• GPT-5 and o3 snapshots retire on December 11, 2026
• modelshift found 131 retiring model IDs across 296 files in four repos
• Claude Opus 4.7 and later return 400 for temperature, top_p, top_k