---
title: "Firebase AI Logic in JavaScript SDK 13.0.0 makes gemini-3.5-flash-lite the default hybrid in-cloud model: 2026-10-07 | Harbyn"
description: "Firebase AI Logic in JavaScript SDK 13.0.0 makes gemini-3.5-flash-lite the default hybrid in-cloud model, announced Oct 7, 2026."
canonical: "https://harbyn.com/changes/firebase/2026-10-07-default-hybrid-in-cloud-model-changed"
last-updated: 2026-10-07
---

# Firebase AI Logic in JavaScript SDK 13.0.0 makes gemini-3.5-flash-lite the default hybrid in-cloud model

Markdown version of <https://harbyn.com/changes/firebase/2026-10-07-default-hybrid-in-cloud-model-changed>.

Behavior change - Firebase. medium severity. In effect.

Firebase JavaScript SDK 13.0.0 changes the default in-cloud model used by AI Logic hybrid inference to gemini-3.5-flash-lite. Apps that rely on the default get a different model after upgrading.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Firebase](https://harbyn.com/vendors/firebase.md) |
| Kind | Behavior change |
| Severity | medium |
| Status | In effect |
| Announced | Oct 7, 2026 |
| Added to Harbyn | Oct 7, 2026 |
| Lead time | No dated deadline |
| Review | Reviewed by a person, 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 Firebase, 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://firebase.google.com/support/release-notes/js> (changelog, fetched 2026-10-07 23:09 UTC, sha256 `2407d40b1d1bbfdc5572e4c5640df949d51c50d74ee44b8e35cafa4951fb13c5`)

## Related changes

### More from Firebase

- [AI Logic in JavaScript SDK 13.0.0 exports ChatSession as an interface, not a class](https://harbyn.com/changes/firebase/2026-10-07-chatsession-class-replaced-by-interface.md) (Breaking change, announced Oct 7, 2026)
- [AI Logic in JavaScript SDK 13.0.0 removes previously deprecated APIs](https://harbyn.com/changes/firebase/2026-10-07-deprecated-apis-removed.md) (Breaking change, announced Oct 7, 2026)
- [Remote Config in JavaScript SDK 13.0.0 stops false CONFIG\_UPDATE\_STREAM\_ERROR events on backgrounding](https://harbyn.com/changes/firebase/2026-10-07-expected-background-connection-closes-handled-differently.md) (Behavior change, announced Oct 7, 2026)
- [firebase 13.0.0, a new major version](https://harbyn.com/changes/firebase/2026-10-07-firebase-13-0-0.md) (Breaking change, announced Oct 7, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

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