OpenAI Launches GPT-5.4 Mini and Nano Models

Now available in ChatGPT, Codex, and the API.

> GPT‑5.4 mini improves over GPT‑5 mini across coding, reasoning, multimodal understanding, and tool use, while running more than 2x faster.

> GPT‑5.4 nano is the smallest, cheapest version of GPT‑5.4 for tasks where speed & cost matter most.

Source: https://openai.com/index/introduc...
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