GPT 5.4 is the standard tier of the GPT-5.4 model family, extending the agentic and reasoning capabilities of GPT-5.3 Codex to all domains including knowledge work, multi-step workflows, and analysis.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.4', prompt: 'Why is the sky blue?'})GPT 5.4 became available on March 5, 2026 on AI Gateway as the standard tier of the GPT-5.4 model family. It extends the agentic and reasoning leaps introduced in GPT-5.3 Codex to all domains, including knowledge work like reports, spreadsheets, presentations, and analysis.
The model handles complex multi-step workflows more reliably than previous generations, including tasks that involve tools, research, and pulling from multiple sources. It's faster and more token-efficient than GPT-5.2, delivering better results at lower cost per task.
With the context window of 1.1M tokens and the full API feature set, GPT 5.4 supports text, image, and mixed-modality inputs. If you're starting a new project or upgrading from an earlier GPT-5.x model, it's the default starting point for general-purpose work.