Post by OpenAI on X
OpenAI@OpenAI
XGPT-5.4 mini is available today in ChatGPT, Codex, and the API.
Optimized for coding, computer use, multimodal understanding, and subagents. And it’s 2x faster than GPT-5 mini.
t.co

6.4K likes640 repliesPosted Mar 17, 2026