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 (David Gewirtz/ZDNET)

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,…