GPT 5.2 Codex is the GPT-5.2 generation coding agent model from OpenAI, combining GPT-5.2 advances in reasoning with purpose-built autonomous software engineering capabilities.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.2-codex', prompt: 'Why is the sky blue?'})GPT 5.2 Codex became available on December 18, 2025 on AI Gateway as the GPT-5.2 generation coding agent. It combines GPT-5.2's advances in reasoning depth and instruction following with the specialized coding agent architecture that reads repositories, plans changes, writes code, executes tests, and iterates.
The model handles complex multi-file changes, architectural decisions, and codebase-wide refactoring with GPT-5.2 generation quality. The context window of 400K tokens enables comprehensive repository understanding.
For teams building AI-powered development tools, GPT 5.2 Codex provides GPT-5.2 generation capability in the codex agent architecture.