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GPT 5.1 Codex Mini

GPT 5.1 Codex Mini is the lightweight, fast variant in the GPT-5.1 codex family, optimized for routine coding tasks like bug fixes, feature scaffolding, and test generation at a cost that scales to high-frequency CI and development workflows.

ReasoningFile InputVision (Image)Tool UseImplicit Caching
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.1-codex-mini',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does GPT 5.1 Codex Mini compare to standard GPT-5.1 codex?

    It's faster and cheaper but with less reasoning depth. It handles routine tasks well and is designed for high-frequency use in CI pipelines and development workflows.

  • Is GPT 5.1 Codex Mini good enough for code review?

    Yes, for standard code review. For security audits or architecturally complex changes, escalate to standard codex or codex max.

  • What context window does GPT 5.1 Codex Mini support?

    400K tokens, sufficient for understanding the relevant portions of most codebases.

  • How does AI Gateway handle authentication for GPT 5.1 Codex Mini?

    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.

  • Can I run GPT 5.1 Codex Mini on every commit?

    Yes. Its pricing is designed to make per-commit and per-PR automation economically viable.

  • What are typical latency characteristics?

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