# Gemini 3\.5 Flash on AI Gateway

**Published:** May 19, 2026 | **Authors:** Walter Korman, Rohan Taneja, Jerilyn Zheng

---

Gemini 3.5 Flash is now available on [Vercel AI Gateway](https://vercel.com/ai-gateway).

This model has improved coding proficiency and parallel agentic execution loops versus previous Flash versions. It also brings improvements to core reasoning, instruction following, and multi-turn coherence, with stronger performance on complex tasks and higher-quality reasoning traces in thinking mode.

3.5 Flash defaults to the `medium` thinking level, balancing response quality with faster, more cost-efficient generation.

To use Gemini 3.5 Flash, set model to `google/gemini-3.5-flash` in the [AI SDK](https://ai-sdk.dev/).

```typescript
import { streamText } from 'ai';
const result = streamText({
  model: 'google/gemini-3.5-flash',
  prompt: 'Refactor this service to run API calls in parallel.',
  providerOptions: {
    google: { // use vertex or google
      thinkingConfig: {
        thinkingLevel: 'high',
        includeThoughts: true,
    },
  },
});
```

Note that `temperature`, `topP`, `topK`, and `thinking_budget` are not supported by this model.

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 [custom reporting](https://vercel.com/docs/ai-gateway/capabilities/custom-reporting), [observability](https://vercel.com/docs/observability/ai-sdk-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/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/gemini-3.5-flash).

---

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