OpenAI launches GPT-5.4, calling it its most capable and efficient AI model yet, with AI agents, computer control, improved reasoning, and a 1M-token context.

Sources allege the Defense Department experimented with Microsoft’s version of OpenAI technology before the ChatGPT-maker lifted its prohibition on military applications.

GPT-5.4 is out now on ChatGPT (where it goes by the name GPT-5.4 Thinking) as well as on the OpenAI API and OpenAI’s coding ...

While OpenAI is bringing GPT-5.4 to its API and its AI-powered coding tool, Codex, it’s rolling out its reasoning model, ...

Following that behavioral change, the company has tagged on an additional release. OpenAI made ChatGPT-5.4 official, marking it as an upgrade for users who need the model for “professional” work and ...

The big headlines on this release are efficiency, with OpenAI reporting that GPT-5.4 uses far fewer tokens (47% fewer on some tasks) than its predecessors).

The company bills API users based on the number of tokens that its LLMs process while generating a prompt response. A token is a unit of data that comprises a few letters or characters. OpenAI says ...

OpenAI’s GPT-5.4 is rolling out in GitHub Copilot, bringing stronger reasoning, better coding accuracy, and improved support for complex tasks.

OpenAI’s new GPT-5.4 model promises stronger reasoning, better coding capabilities and the ability to handle longer, more complex tasks. To see how well those claims hold up, I tested the model with ...

OpenAI has launched GPT-5.4, its first model with native computer-use capabilities, alongside financial plugins for Microsoft Excel and Google Sheets.