This March 17, 2026 article introduces GPT-5.4 mini and nano as OpenAI’s newest small models, aimed at high-volume work where speed, responsiveness, and cost matter more than using the largest model. It says GPT-5.4 mini is more than twice as fast as GPT-5 mini while improving coding, reasoning, vision, and tool use, and that it comes close to full GPT-5.4 on several coding and computer-use benchmarks. GPT-5.4 nano is described as the smallest and cheapest option, meant for lighter jobs like classification, extraction, ranking, and simpler coding subagents. The piece also emphasizes how these models fit into multi-model workflows, with larger models handling planning and smaller ones taking on narrow tasks in parallel. OpenAI says GPT-5.4 mini is available in the API, Codex, and ChatGPT, while nano is API-only, with mini priced at $0.75 per million input tokens and $4.50 per million output tokens, and nano at $0.20 and $1.25 respectively.

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