v1.99.0-rc.2

Pre-release

BerriAI/litellmv1.99.0-rc.2Aug 30, 2026by github-actions[bot]

AI Summary

This release serves as a backport of fixes from v1.100.0-rc.1, addressing UI regressions from the shadcn migration, fixing e2e tests for Vertex AI and vision, and correcting Anthropic tool_result document block translations.

Key Highlights

Backports UI fixes for shadcn migration regressions.
Fixes for Vertex AI realtime and vision image fixtures in e2e tests.
Corrects tool_result document block translation in the Anthropic bridge.
Stabilizes router fallback specifications to reduce flakiness.

Full Release Notes

## Verify Docker Image Signature

All LiteLLM Docker images are signed with [cosign](https://docs.sigstore.dev/cosign/overview/). Every release is signed with the same key introduced in [commit `0112e53`](https://github.com/BerriAI/litellm/commit/0112e53046018d726492c814b3644b7d376029d0).

**Verify using the pinned commit hash (recommended):**

A commit hash is cryptographically immutable, so this is the strongest way to ensure you are using the original signing key:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/0112e53046018d726492c814b3644b7d376029d0/cosign.pub \
  ghcr.io/berriai/litellm:v1.99.0-rc.2
```

**Verify using the release tag (convenience):**

Tags are protected in this repository and resolve to the same key. This option is easier to read but relies on tag protection rules:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/v1.99.0-rc.2/cosign.pub \
  ghcr.io/berriai/litellm:v1.99.0-rc.2
```

Expected output:

```
The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - The signatures were verified against the specified public key
```

---
## What's Changed
* fix(ui): backport the shadcn migration regression fixes onto 1.99.0 by @yuneng-berri in https://github.com/BerriAI/litellm/pull/38821
* fix(e2e): backport the vertex realtime and vision image fixture fixes to rc/1.99.0 by @yuneng-berri in https://github.com/BerriAI/litellm/pull/38848
* fix(ui): drop stray text next to Close in the model connection test dialog by @yuneng-berri in https://github.com/BerriAI/litellm/pull/38854
* [Backport rc/1.99.0] fix(anthropic): translate tool_result document blocks in the /v1/messages bridge by @yuneng-berri in https://github.com/BerriAI/litellm/pull/38855
* test(e2e): backport the select-anchoring and router-fallback spec de-flakes by @yuneng-berri in https://github.com/BerriAI/litellm/pull/38862


**Full Changelog**: https://github.com/BerriAI/litellm/compare/v1.99.0-rc.1...v1.99.0-rc.2