GPT-5.3-Codex advances both the frontier coding performance of GPT‑5.2-Codex and the reasoning and professional knowledge capabilities of GPT‑5.2, together in one model, which is also 25% faster. This enables it to take on long-running tasks that involve research, tool use, and complex execution.
ReasoningTool UseFile InputVision (Image)Web SearchImplicit Caching
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.3-codex', prompt: 'Why is the sky blue?'})
