---
title: "v1.5.0-prerelease3"
description: "v1.5.0-prerelease3 changelog - 2026-04-13"
---
<Tabs>
  <Tab title="NPX">
    ```bash
    npx -y @maximhq/bifrost --transport-version v1.5.0-prerelease3
    ```
  </Tab>
  <Tab title="Docker">
    ```bash
    docker pull maximhq/bifrost:v1.5.0-prerelease3
    docker run -p 8080:8080 maximhq/bifrost:v1.5.0-prerelease3
    ```
  </Tab>
</Tabs>

<Update label="Bifrost(HTTP)" description="1.5.0-prerelease3">
## ✨ 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

- **Streaming Post-Hook Race** — Fix race condition where fasthttp RequestCtx could be recycled before transport post-hooks complete in streaming goroutines; eagerly captures request/response snapshots before handler returns
- **Async User Values** — Propagate user values through all async inference handlers and job submissions
- **Trace Completer Safety** — Refactor trace completer to accept transport logs as parameter instead of reading from potentially recycled context
- **Async Log Store Exceptions** — Fix exception handling in async log store jobs
- **Model Alias Tracking** — Split ModelRequested into OriginalModelRequested and ResolvedModelUsed for accurate model alias resolution tracking
- **MCP Tool Discovery** — Add discovered tools and tool name mapping columns to MCP clients

</Update>
<Update label="Core" description="1.5.2">
- refactor: split ModelRequested into OriginalModelRequested and ResolvedModelUsed for model alias tracking
- refactor: simplify Azure passthrough by removing redundant config nil checks
- refactor: simplify Mistral error parsing signature
- fix: carry ProviderResponseHeaders through text completion response conversion

</Update>
<Update label="Framework" description="1.3.2">
- feat: add MCP client discovered tools and tool name mapping migration
- fix: exception handling in async log store jobs
- refactor: model catalog Init API to use SetShouldSyncGate method
- refactor: rename DefaultPricingSyncInterval to DefaultSyncInterval

</Update>
<Update label="compat" description="0.1.1">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="governance" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="jsonparser" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="litellmcompat" description="0.1.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="logging" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="maxim" description="1.6.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="mocker" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="otel" description="1.2.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="prompts" description="1.0.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="semanticcache" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>
<Update label="telemetry" description="1.5.2">
- chore: upgraded core to v1.5.2 and framework to v1.3.2

</Update>