Four legacy OpenAI models shut down on September 28, 2026

Legacy completions, fine-tuning-era base-model, and pinned GPT-3.5 integrations using these IDs will lose model access.

Recommended action: Replace the retired model ID with an official recommended model, update the API request shape where required, and regression-test prompts and outputs.

Affected: gpt-3.5-turbo-instruct, babbage-002, davinci-002, gpt-3.5-turbo-1106, legacy GPT model, Completions API, Chat Completions API, model