GPT 4.1 is announced as 3x developer-centric model releases available specifically via API. An internal instruction following eval was used to improve the model’s ability to follow instructions. Context size is 1m tokens. Pricing appears competitive if the new models have similar performance to Gemini/Sonnet:

gpt-4.1 $2/mil tokens input, $8/mil tokens output
gpt-4.1-mini $0.4/mil tokens input, $1.60/mil tokens output
gpt-4.1-nano $0.1/mil tokens input, $0.4/mil tokens output

GPT 4.5 will be deprecated over API in a few months