OpenAI Is Closing Fine-Tuning in January 2027. Here Is Where to Train Instead

Go and read OpenAI's deprecations page. Not a blog post about it, the page itself, dated 7 May 2026. If your organisation has never run a fine-tuning job, you cannot start one. Since 2 July 2026, new jobs need inference on a fine-tuned model within the previous 60 days. On 6 January 2027 that door shuts for everybody, and fine-tuned gpt-3.5-turbo, gpt-4, gpt-4.1-nano, babbage-002 and davinci-002 go dark on 23 October 2026. I put together the full comparison on DevToolLab with every price…