October 8, 2026
- **Gemini 3.5 Flash deprecation** : [`gemini-3.5-flash`](https://ai.google.dev/gemini-api/docs/whats-new-gemini-3.5) is deprecated and has been replaced by [`gemini-3.6-flash`](https://ai.google.dev/gemini-api/docs/whats-new-gemini-3.6). It is no longer available to select in Google AI Studio, and API requests to `gemini-3.5-flash` are automatically routed to `gemini-3.6-flash`. Update your model string to `gemini-3.6-flash` (or [`gemini-3.8-flash`](https://ai.google.dev/gemini-api/docs/latest-model)) and review the [Gemini 3.6 Flash guide](https://ai.google.dev/gemini-api/docs/whats-new-gemini-3.6).
- **Deep Research Agent `deep-research-pro-preview-12-2025` deprecation** :
The `deep-research-pro-preview-12-2025` agent is deprecated and will be
[shut down](https://ai.google.dev/gemini-api/docs/deprecations#managed-agents) on **October 23,
2026**.
Migrate your requests to one of the newer [Deep
Research](https://ai.google.dev/gemini-api/docs/deep-research) agent versions:
- [`deep-research-preview-04-2026`](https://ai.google.dev/gemini-api/docs/models/deep-research-preview-04-2026): Designed for speed and efficiency, ideal to be streamed back to a client UI.
- [`deep-research-max-preview-04-2026`](https://ai.google.dev/gemini-api/docs/models/deep-research-max-preview-04-2026): Maximum comprehensiveness for automated context gathering and synthesis.
To migrate, update the `agent` parameter in your `interactions.create`
requests from `deep-research-pro-preview-12-2025` to
`deep-research-preview-04-2026` (or `deep-research-max-preview-04-2026`).
Original source ↗ Crawled: 13 Oct 2026 09:10