OpenAI just launched GPT 5.4 mini and nano models which are now live in the API, Codex, and ChatGPT with improved coding capabilities.
OpenAI's new GPT-5.4 mini model offers performance improvements in reasoning, multimodal understanding and more.
When OpenAI announced that it would retire its ChatGPT model GPT-4o, it sent shockwaves across the internet and an outpouring of grief. Yet the real question is: What void was 4o filling to begin with ...