---
title: "Google Gemini API Gemini 3.5 Flash deprecated: 2026-10-08 | Harbyn"
description: "Google Gemini API Gemini 3.5 Flash deprecated, announced Oct 8, 2026; replacement: gemini-3.6-flash."
canonical: "https://harbyn.com/changes/google-gemini/2026-10-08-gemini-3-5-flash-deprecated"
last-updated: 2026-10-10
---

# Google Gemini API Gemini 3.5 Flash deprecated

Markdown version of <https://harbyn.com/changes/google-gemini/2026-10-08-gemini-3-5-flash-deprecated>.

Deprecation - Google Gemini API. low severity. In effect.

gemini-3.5-flash is deprecated and requests are automatically routed to gemini-3.6-flash.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Google Gemini API](https://harbyn.com/vendors/google-gemini.md) |
| Kind | Deprecation |
| Severity | low |
| Status | In effect |
| Announced | Oct 8, 2026 |
| Added to Harbyn | Oct 10, 2026 |
| Lead time | No dated deadline |
| Symbols | `gemini-3.5-flash` |
| Replacement | `gemini-3.6-flash` |
| Review | Automated, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Google Gemini API, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://ai.google.dev/gemini-api/docs/changelog.md.txt> (changelog, fetched 2026-10-10 05:59 UTC, sha256 `11974bad25e4d2a5b80061738d2b6bf82412847a635318b95b837a0381405046`)

## Related changes

### More from Google Gemini API

- [gemini-2.5-flash-image shutdown 2027-03-15 (rescheduled)](https://harbyn.com/changes/google-gemini/2026-10-07-gemini-2-5-flash-image-shutdown-2027-03-15-rescheduled.md) (Retirement, effective Mar 15, 2027)
- [gemini-3.1-flash-live-preview and 1 more shutdown 2026-11-17](https://harbyn.com/changes/google-gemini/2026-10-07-gemini-3-1-flash-live-preview-shutdown-2026-11-17.md) (Retirement, effective Nov 17, 2026)
- [gemini-3.1-flash-tts-preview and 2 more shutdown 2026-11-17](https://harbyn.com/changes/google-gemini/2026-10-07-gemini-3-1-flash-tts-preview-shutdown-2026-11-17.md) (Retirement, effective Nov 17, 2026)
- [veo-3.1-lite-generate-preview and 3 more shutdown 2026-10-22](https://harbyn.com/changes/google-gemini/2026-10-07-veo-3-1-lite-generate-preview-shutdown-2026-10-22.md) (Retirement, effective Oct 22, 2026)

### Changes at other vendors

- [AWS Lambda: Python 3.10 runtime deprecation](https://harbyn.com/changes/aws-lambda/2026-10-08-python-3-10-runtime-deprecation.md) (effective Oct 31, 2026)
- [Jira / Atlassian Cloud: Atlassian Analytics dashboard subscriptions being removed](https://harbyn.com/changes/atlassian-jira/2026-08-10-atlassian-analytics-dashboard-subscriptions-being-removed.md) (effective Nov 2, 2026)
- [Google Cloud Run and Functions: .NET 8 runtime deprecation](https://harbyn.com/changes/google-cloud/2026-10-08-net-8-runtime-deprecation.md) (effective Nov 10, 2026)
- [GitHub: X-GitHub-Stateless-S2S-Token header ignored from 2026-11-30](https://harbyn.com/changes/github/2026-10-02-x-github-stateless-s2s-token-header-ignored-from-2026-11-30.md) (effective Nov 30, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)