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GPT 5.2 Codex

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.

ReasoningTool UseImplicit CachingVision (Image)File Input
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.2-codex',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does GPT 5.2 Codex improve over GPT-5.1 codex?

    It incorporates the GPT-5.2 generation's advances in reasoning and instruction following, translating to better code quality and more reliable autonomous task completion.

  • What context window does GPT 5.2 Codex support?

    400K tokens, enabling comprehensive codebase analysis.

  • Can GPT 5.2 Codex run tests and verify its own code?

    Yes. It operates in sandboxed environments where it can execute code, run tests, and iterate on solutions.

  • How does AI Gateway handle authentication for GPT 5.2 Codex?

    AI Gateway accepts a single API key or OIDC token for all requests. You don't embed OpenAI credentials in your application; AI Gateway routes and authenticates on your behalf.

  • When should I use an earlier codex model instead?

    When cost is a primary concern and the task doesn't require GPT-5.2 generation improvements. Codex mini variants handle routine tasks at a fraction of the cost.

  • What are typical latency characteristics?

    This page shows live throughput and time-to-first-token metrics measured across real AI Gateway traffic.