Introducing GPT-5.4 mini and nano

What changed

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.

Why it matters

A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.

How it compares

Related prior coverage to compare against:

• Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT
• Introducing GPT-4.1 in the API
• Introducing GPT-5 for developers

• Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT similarity 0.39
• Introducing GPT-4.1 in the API similarity 0.26
• Introducing GPT-5 for developers similarity 0.25