David Gewirtz / ZDNET : OpenAI launches GPT-5.4 mini and nano, aimed at agents, coding, and multi-modal workflows, and offering near GPT-5.4-level performance at a much lower cost —  ZDNET's key takeaways  — GPT-5.4 mini runs more than twice as fast as GPT-5 mini.  — New models aim at agents, coding, and multi-modal workflows.