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GPT 5.2 Codex

openai/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?'
})

What To Consider When Choosing a Provider

  • Zero Data Retention

    AI Gateway supports Zero Data Retention for this model via direct gateway requests (BYOK is not included). To configure this, check the documentation.

    Authentication

    AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.

GPT 5.2 Codex incorporates GPT-5.2 generation improvements for better code comprehension and more reliable autonomous task completion over GPT-5.1 codex.

Like other codex models, it operates in the read-plan-write-execute-verify loop rather than one-shot code generation.

When to Use GPT 5.2 Codex

Best For

  • Complex autonomous coding:

    Software engineering tasks that benefit from GPT-5.2 generation reasoning

  • Enterprise codebase management:

    Large-scale refactoring, migration, and modernization projects

  • Advanced code review:

    Deep architectural analysis with GPT-5.2 generation reasoning

  • Complex feature development:

    Multi-component features that span services and modules

  • Code quality enforcement:

    Comprehensive analysis and improvement of existing codebases

Consider Alternatives When

  • Routine coding:

    Codex mini variants for everyday bug fixes and feature scaffolding

  • Maximum compute:

    GPT-5.1 codex max for tasks that benefit from extended reasoning time

  • Non-coding tasks:

    Base GPT-5.2 handles general-purpose reasoning and generation outside the read-plan-write-execute-verify codex loop

  • Budget constraints:

    Earlier codex generations at lower price points

Conclusion

GPT 5.2 Codex combines GPT-5.2 generation improvements with purpose-built autonomous coding capabilities. For software engineering workflows on AI Gateway, it is the codex option within the GPT-5.2 family.

FAQ

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.

400K tokens, enabling comprehensive codebase analysis.

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

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 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.

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