OpenAI will remove GPT-4o and GPT-4.1 from its API on January 14, 2027

On October 14, 2026, OpenAI told developers that four GPT-4 series models are deprecated. They will be removed from the API on January 14, 2027. OpenAI’s recommended replacement for all four is GPT-6 Luna (gpt-6-luna). Fine-tuned versions of these models follow the same shutdown date as their base models.

Which models are going

Model	Snapshots	Standard price per 1M (input / output)
GPT-4o	gpt-4o-2024-08-06, gpt-4o-2024-11-20	$2.50 / $10.00
GPT-4o mini	gpt-4o-mini-2024-07-18	$0.15 / $0.60
GPT-4.1	gpt-4.1-2025-04-14	$2.00 / $8.00
GPT-4.1 mini	gpt-4.1-mini-2025-04-14	$0.40 / $1.60
GPT-6 Luna	replacement	$0.10 / $0.50

Prices are from OpenAI’s pricing page on October 18, 2026.

Cheaper, but a different kind of model

On price per token, GPT-6 Luna is lower than all four. It is a reasoning model, though: it has a reasoning.effort setting from none to max, with medium as the default. In Chat Completions, Luna supports function calling only when effort is set to none. Apps built on GPT-4o’s plain chat behavior should test both cost per task and output style.

More removals on the same page

• April 1, 2027: gpt-5.1, gpt-5.3-codex (replacement gpt-6-sol) and gpt-5.4-nano (replacement gpt-6-luna), announced October 1, 2026.
• December 11, 2026: the dated gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-pro, o3 and o3-pro snapshots, announced June 11, 2026.
• January 6, 2027: the tts-1 text-to-speech models, announced October 1, 2026.

What to do

Search your code and your usage dashboard for these model IDs, including fine-tuned models built on them. Move them before January 14, 2027, when OpenAI removes them from the API.