OpenAI has announced the release of GPT-4.5, a research preview of its latest and most powerful large language model for chat applications. It’s still more of a classical LLM. GPT-4.5 is available to subscribers of OpenAI’s most expensive subscription tier and developers across all paid API tiers. GPT‑4.5 is able to access search and OpenAI’s ChatGPT Canvas mode, and users can upload files and images to it, but it doesn’t have other multimodal features like voice mode, video, and screensharing.