Introducing GPT-5.4 mini and nano
GPT-5.4 mini and nano are smaller, faster versions of GPT-5.4 optimized for coding, tool use, multimodal reasoning, and high-volume API and sub-agent workloads.
Signal weather
The story has moved beyond the first headline and now acts as a reliable context anchor.
Why now
This story is still moving and pulling follow-up coverage.