* **Gemini 3.7 Flash deprecation**:
[`gemini-3.7-flash`](/docs/whats-new-gemini-3.7) is deprecated and has been
replaced by [`gemini-3.8-flash`](/docs/whats-new-gemini-3.8). It is no longer
available to select in Google AI Studio, and API requests to
`gemini-3.7-flash` are automatically routed to `gemini-3.8-flash`. Update
your model string to `gemini-3.8-flash` and review the
[Gemini 3.8 Flash guide](/docs/whats-new-gemini-3.8).

* **Gemini 3.5 Flash deprecation**:
[`gemini-3.5-flash`](/docs/whats-new-gemini-3.5) is deprecated and has been
replaced by [`gemini-3.6-flash`](/docs/whats-new-gemini-3.6).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`](/docs/whats-new-gemini-3.8)) and review the
[Gemini 3.6 Flash guide](/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](/docs/deprecations#managed-agents) on **October 23, 2026**.

Migrate your requests to one of the newer [Deep
Research](/docs/deep-research) agent versions:

* [`deep-research-preview-04-2026`](/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`](/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`).