---
title: "v1.4.22"
description: "v1.4.22 changelog - 2026-04-11"
---
<Tabs>
  <Tab title="NPX">
    ```bash
    npx -y @maximhq/bifrost --transport-version v1.4.22
    ```
  </Tab>
  <Tab title="Docker">
    ```bash
    docker pull maximhq/bifrost:v1.4.22
    docker run -p 8080:8080 maximhq/bifrost:v1.4.22
    ```
  </Tab>
</Tabs>

<Update label="Bifrost(HTTP)" description="1.4.22">
## ✨ Features

- **OAuth MCP** - add next-step hints to OAuth MCP client creation response
- **Azure passthrough** - added azure passthrough support
- **272k token tier** - add 272k token tier pricing support in pricing
- **Flex and priority tier support** - added flex and priority tier support in pricing

## 🐞 Fixed

- **Response Backfill** — Added response parameter backfilling for chat completion and responses requests, ensuring model, object type, and created timestamp fields are always populated
- **Mistral Provider Cleanup** — Removed redundant provider key normalization and duplicate OCR validation from Mistral provider

</Update>
<Update label="Core" description="1.4.19">
- refactor: add BackfillParams methods to BifrostChatResponse and BifrostResponsesResponse for populating missing response fields
- refactor: remove custom provider key normalization and redundant OCR validation from Mistral provider
- fix: minor formatting inconsistencies in response type constants

</Update>
<Update label="Framework" description="1.2.38">
- chore: upgraded core to v1.4.19
- fix: don't mark oauth config expired on transient refresh failures
- fix: only treat invalid_grant and unauthorized_client as permanent OAuth errors
- feat: add tiered and priority/flex pricing support — 272k token tier fields, 200k priority variants, and tier selection based on service_tier in responses

</Update>
<Update label="governance" description="1.4.38">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="jsonparser" description="1.4.37">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="litellmcompat" description="0.0.27">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="logging" description="1.4.38">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="maxim" description="1.5.38">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="mocker" description="1.4.37">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="otel" description="1.1.37">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="semanticcache" description="1.4.36">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>
<Update label="telemetry" description="1.4.38">
- chore: upgraded core to v1.4.19 and framework to v1.2.38

</Update>