GPT-5.4 represents OpenAI's effort to unify the Codex and GPT lines into a single frontier system, aimed at both general-purpose tasks and software engineering. It is positioned as a strong default model that can generate production-quality code, synthesize information across multiple sources, and execute complex multi-step workflows with fewer iterations and greater token efficiency. Compared with its predecessor, all GPT-5.4 variants reportedly produce 33% fewer factual errors, reflecting improvements in instruction following and reliability for production workloads.

Beyond standard reasoning, GPT-5.4 introduces native computer-use capabilities, scoring 75% on OSWorld and exceeding the human baseline of 72.4%, which lets it browse the web, interact with desktop applications, fill forms, and run multi-step workflows without external frameworks. A dynamic tool-search mechanism loads only relevant tools from a library of 50+ options, cutting prompt token usage by 47% and improving tool-selection accuracy. On coding, the model posts a 57.7% SWE-Bench Pro score, and a 272K native API context extends to 1M tokens through Codex integration, enabling processing of entire codebases and large document collections.