OpenAI's API pricing page drops ten older models, including o1, o1-pro and GPT-4

Ten older models disappeared from OpenAI's API pricing page on November 2, 2026. This is the pricing page itself, not an OpenAI announcement, and removal from a pricing page is not by itself a retirement notice. The page's entries give prices without a unit.

Last listed (input / output, with cached input where the page showed one):

• Reasoning models: o1 15 / 60 (cached 7.5); o1-pro 150 / 600; o3-mini 1.1 / 4.4 (cached 0.55); o4-mini 1.1 / 4.4 (cached 0.275).
• GPT-4 family: gpt-4-0613 30 / 60; gpt-4-turbo-2024-04-09 10 / 30; gpt-4o-2024-05-13 5 / 15; gpt-4.1-nano 0.1 / 0.4 (cached 0.025).
• GPT-3.5: gpt-3.5-turbo and gpt-3.5-turbo-0125, both 0.5 / 1.5.