OpenAI shuts down gpt-4, gpt-4-turbo, gpt-3.5-turbo, gpt-4.1-nano, o1, o1-pro, o3-mini, o4-mini, gpt-image-1 and six fine-tuned model families on October 23, 2026, seven days from today.
For a workload of 10 million input and 2 million output tokens a month, gpt-4-0613 costs $420 and the named replacement gpt-5.6-sol costs $80, while gpt-3.5-turbo costs $8 and gpt-5.6-terra costs $44.
Fine-tuned models cannot be swapped by changing a string. They shut down on the same date and need a new fine-tuning job on a supported base model.
A second wave on December 11 retires gpt-5, o3 and o3-pro, so choose a replacement that survives it.