Native Computer Use
The model controls computers directly — browser, desktop apps, file system — without external tooling wrappers. This isn't a separate API or an add-on; it's built into the model. For agentic workflows that involve real software interfaces, this is a step toward agents that can operate across any desktop or web application without custom integration.
1 Million Token Context
Available in Codex and the API. At 1M tokens, you can fit entire large codebases, book-length documents, or months of email history in a single context. The constraint of "the relevant information doesn't fit" becomes less binding for an increasing range of real tasks.
Tool Search Across Large Ecosystems
As MCP tool libraries grow — some developers now have dozens or hundreds of tools available — finding the right tool becomes a bottleneck. GPT-5.4 is specifically optimized for tool search quality at scale.
Efficient Long-Horizon Reasoning
Complex agent tasks that involve many sequential tool calls have historically degraded in quality toward the end. GPT-5.4 is optimized for long, tool-heavy workflows where coherence over many steps matters.
Sam Altman's Finance Comment
Altman noted that GPT-5.4 is "really good at spreadsheets" and that finance professionals are expressing genuine concern about AI capability for the first time. For structured data analysis — a category finance runs on — this is the capability jump that's moving people from interested to worried.
The model is available now in the API and Codex.