Rumors about GPT-5.4 include enhanced logical reasoning, full-size image support via API, fast mode for priority processing, and possible PC control capabilities.
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OpenAI has sparked interest in GPT-5.4 with a brief post on X that read "5.4 sooner than you think." The phrasing, which emphasizes the word "think," has led to speculation that the new version might feature enhanced logical reasoning capabilities. While the tweet didn't provide details, many interpreted it as a hint at an imminent announcement.
Interest grew further after code fragments related to GPT-5.4 were discovered in the Codex repository. Notably, developers added a function for transmitting images in their original quality via the API without standard compression—supporting PNG, JPEG, and WebP formats. Initially, the code indicated this option was specifically for version 5.4, though the labeling was later changed.
Additionally, a mention of a "fast mode" was found in the Codex terminal interface, allowing requests to be processed with higher priority. This could point to a separate performance tier or a new monetization model. Meanwhile, rumors about a context window of up to 2 million tokens and support for state preservation between sessions have not been officially confirmed.
Beyond that, the AI is also rumored to gain capabilities for controlling a user's PC, including the ability to navigate operating system interfaces independently.
At this point, the only reliable information is the preparation for full-size image support and priority request processing. When GPT-5.4 will be unveiled remains unknown, but activity in the codebase and social media hints suggest a release could happen soon.