OpenAI just dropped GPT-5.4 Mini and Nano.

Mini is 2x faster than GPT-5 mini with a 400k context window. Handles coding, computer use, and multimodal tasks while nearly matching full 5.4 on SWE-Bench Pro. Already live in ChatGPT.

Nano is API-only, built for lightweight tasks at OpenAI's lowest price point.

For most daily tasks, Mini gives you near-5.4 performance at a fraction of the cost.