OpenAI: GPT-5.4 mini is available today in ChatGPT, Codex, and the API. It's optimized for coding, computer usage, multimodal understanding, and sub-agents. It's twice as fast as GPT-5 mini. GPT-5.4 nano is also available in the API starting today.

2026-03-18

OpenAI: GPT-5.4 mini is available today in ChatGPT, Codex, and the API. It's optimized for coding, computer usage, multimodal understanding, and sub-agents. It's twice as fast as GPT-5 mini. GPT-5.4 nano is also available in the API starting today.