Four legacy OpenAI models shut down on September 28, 2026

What breaks

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

• Requests using the listed model IDs will stop working after shutdown.

Affected identifiers and fields

Search your code, environment variables, gateway configuration, and stored request templates for these exact values.

• gpt-3.5-turbo-instruct
• babbage-002
• davinci-002
• gpt-3.5-turbo-1106

• legacy GPT model
• Completions API
• Chat Completions API
• model

Migration target

Choose gpt-5.4-mini or gpt-5-mini based on workload requirements, then migrate and test the integration.

• gpt-5.4-mini
• gpt-5-mini

What to do

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

Official source receipts

These provider pages support the dates, identifiers, symptoms, and migration direction recorded above.