OpenAIs coding model was launched in the API only on April 14th, and reduced costs compared to GPT 4.5.
It also comes with a large context window of 1 million «tokens.» These are compute units that roughly translates to 750,000 words — so this model can read and output very large files or codebases.
It should be available under the model selector menu by clicking on «More models.»
UPDATE: It seems that without announcement of fanfare, free users on ChatGPT.com now get 4.1-mini as the new default model, a step up from the previous 4o-mini.
Despite some reports, GPT-4.1 does not appear to be the default for paid users—ChatGPT Plus still opens with GPT-4o as standard
By popular request, GPT-4.1 will be available directly in ChatGPT starting today.
GPT-4.1 is a specialized model that excels at coding tasks & instruction following. Because it’s faster, it’s a great alternative to OpenAI o3 & o4-mini for everyday coding needs.
— OpenAI (@OpenAI) May 14, 2025
Read more: OpenAI’s model release notes, Ars Technica bemoans model confusion, Teknotum on the 4.1 launch.