# GPT 5\.3 Chat is now on AI Gateway

**Published:** March 3, 2026 | **Authors:** Walter Korman, Rohan Taneja, Jerilyn Zheng

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GPT-5.3 Chat (GPT 5.3 Instant) is now available on AI Gateway.

This update focuses on tone, relevance, and conversational flow for more accurate answers, better-contextualized web results, and fewer unnecessary refusals and caveats. It also reduces hallucination rates and produces smoother and more direct responses.

To use this model, set model to `openai/gpt-5.3-chat` in the AI SDK.

```tsx
import { streamText } from 'ai';
const result = streamText({
  model: 'openai/gpt-5.3-chat',
  prompt: 'Best restaurants in SF for a birthday dinner.',
});
```

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/capabilities/observability), [Bring Your Own Key](https://vercel.com/docs/ai-gateway#bring-your-own-key) support, and intelligent provider routing with automatic retries.

Learn more about [AI Gateway](https://vercel.com/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-5.3-chat).

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