OpenAI announced the release of GPT-5.4, its newest foundation model designed for professional workloads. The model is offered in three versions—a standard release, a high‑performance Pro edition, and a reasoning‑focused Thinking edition. GPT-5.4 features a context window of up to one million tokens and delivers significant token‑efficiency gains, allowing it to solve tasks with fewer tokens than prior models. Benchmark scores show record performance across computer‑use and knowledge‑work tests, while safety updates cut hallucinations by roughly one‑third. A new tool‑calling architecture called Tool Search reduces token overhead when accessing many tools, and a safety evaluation demonstrates lower risk of deceptive chain‑of‑thought behavior in the Thinking version. Read more →