INTRODUCING GPT‑5.4

Summary from the TLDR newsletter

OpenAI has released GPT-5.4. It is available as two new API models, gpt-5.4 and gpt-5.4-pro, and also in ChatGPT and Codex CLI. The model has a knowledge cut of date of August 31, 2025, and a one-million-token context window. OpenAI put a particular focus on improving the model's ability to create and edit spreadsheets, presentations, and documents. It beats GPT-5.3-Codex on all relevant benchmarks.