# GPT 5\.1 Codex models now available in Vercel AI Gateway

**Published:** November 13, 2025 | **Authors:** Rohan Taneja, Walter Korman, Jerilyn Zheng

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You can now access OpenAI's latest Codex models, GPT-5.1 Codex and GPT-5.1 Codex mini with Vercel's [AI Gateway](https://vercel.com/ai-gateway) and no other provider accounts required. These Codex models are optimized for long-running, agentic coding tasks and are able to maintain context and reasoning over longer sessions without degradation.

To use these models with the [AI SDK](https://ai-sdk.dev/), set the model to `openai/gpt-5.1-codex` or `openai/gpt-5.1-codex-mini`:

```tsx
import { streamText } from 'ai';
const result = streamText({
  model: 'openai/gpt-5.1-codex',
  prompt:
    `Create a command-line tool that reads a text file,
     counts word frequencies, and prints the ten most common
     words with counts. Use standard libraries only.`
});
```

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in [observability](https://vercel.com/docs/ai-gateway/observability), [Bring Your Own Key support](https://vercel.com/docs/ai-gateway/byok), and intelligent [provider routing](https://vercel.com/docs/ai-gateway/provider-options) with automatic retries.

Learn more about [AI Gateway](https://vercel.com/docs/ai-gateway), view the [AI Gateway model leaderboard](https://vercel.com/ai-gateway/leaderboards) or try it in our [model playground](https://vercel.com/ai-gateway/models/gpt-5.1-codex).

**AI Gateway: Track top AI models by usage**
The AI Gateway model leaderboard tracks the most popular models over time, ranking them by the total volume of tokens processed across all Gateway traffic.
[View the leaderboard](https://vercel.com/ai-gateway/leaderboards)

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📚 **More updates:** [View all changelog entries](/changelog/sitemap.md) | [Blog](/blog/sitemap.md)