Breaking model
OpenAI shut down chatgpt-4o-latest on February 17, 2026.
What changes
Announced November 18, 2025, with gpt-5.1-chat-latest as the recommended replacement. That replacement was itself shut down on July 23, 2026, and its listed substitute is gpt-5.6-sol.
Breaking: Calls fail after this date.
What to do
Switch to gpt-5.6-sol, not gpt-5.1-chat-latest. OpenAI's original replacement was itself shut down on July 23, 2026, with gpt-5.6-sol as its substitute.
Strings to search for
chatgpt-4o-latest