> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getbifrost.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# v1.4.22

> v1.4.22 changelog - 2026-04-11

<Tabs>
  <Tab title="NPX">
    ```bash theme={null}
    npx -y @maximhq/bifrost --transport-version v1.4.22
    ```
  </Tab>

  <Tab title="Docker">
    ```bash theme={null}
    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>