> ## 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.

# v1.5.0-prerelease4

> v1.5.0-prerelease4 changelog - 2026-04-21

<Tabs>
  <Tab title="NPX">`bash npx -y @maximhq/bifrost --transport-version v1.5.0-prerelease4 `</Tab>

  <Tab title="Docker">
    ```bash docker pull maximhq/bifrost:v1.5.0-prerelease4 docker run -p 8080:8080 maximhq/bifrost:v1.5.0-prerelease4 theme={null}
    ```
  </Tab>
</Tabs>

<Update label="Bifrost(HTTP)" description="1.5.0-prerelease4">
  ## ✨ Features

  * **Claude Opus 4.7** - Added compatibility for Anthropic's Claude Opus 4.7 model, including adaptive thinking, task-budgets beta header, `display` parameter handling, and "xhigh" effort mapping
  * **Anthropic Structured Outputs** - Added `response_format` and structured output support for Anthropic models across chat completions and Responses API, with order-preserving merge of additional model request fields (thanks [@emirhanmutlu-natuvion](https://github.com/emirhanmutlu-natuvion)!)
  * **MCP Tool Annotations** - Preserve MCP tool annotations (`title`, `readOnly`, `destructive`, `idempotent`, `openWorld`) in bidirectional conversion so agents can reason about tool behavior
  * **Anthropic Server Tools** - Expanded Anthropic chat schema and Responses converters to surface server-side tools (web search, code execution, computer use containers) end-to-end
  * **OCR Request Support** - Added OCR request type with stream terminal detection, full body accumulation for passthrough streams, input logging with detail view, and per-request pricing support
  * **Team Budgets** - New team budget system with per-team spending tracking, atomic ratelimit updates, and database structure support
  * **Single Log Export** - Export individual log entries from the logs view and MCP logs sheet
  * **Deny-by-Default Virtual Keys** - Virtual key provider and MCP configs now block all access when empty; automatic migration backfills existing keys to preserve behavior
  * **User Agent Detection** - Improved multi-user-agent detection with tool call reduplication fix for mixed-client environments
  * **Per-User OAuth Codemode** - OAuth server selection and validation per-user in codemode

  ## 🐞 Fixed

  * **Provider Queue Shutdown Panic** - Eliminated `send on closed channel` panics in provider queue shutdown by leaving channels open and exiting workers via the done signal; stale producers transparently re-route to new queues during `UpdateProvider`
  * **OpenAI Tool Result Output** - Flatten array-form `tool_result` output into a newline-joined string for the Responses API so strict upstreams (Ollama Cloud, openai-go typed models) no longer reject with HTTP 400 (thanks [@martingiguere](https://github.com/martingiguere)!)
  * **vLLM Token Usage** - Treat `delta.content=""` the same as `nil` in streaming so the synthesis chunk retains its `finish_reason`, restoring token usage attribution in logs and UI
  * **Gemini Tool Outputs** - Handle content block tool outputs in Responses API path for `function_call_output` messages (thanks [@tom-diacono](https://github.com/tom-diacono)!)
  * **Bedrock Streaming** - Emit `message_stop` event for Anthropic invoke stream and case-insensitive `anthropic-beta` header merging (thanks [@tefimov](https://github.com/tefimov)!)
  * **Bedrock Tool Images** - Preserve image content blocks in tool results when converting Anthropic Messages to Bedrock Converse API (thanks [@Edward-Upton](https://github.com/Edward-Upton)!)
  * **Gemini Thinking Level** - Preserve `thinkingLevel` parameters across round-trip conversions and correct finish reason mapping
  * **Anthropic WebSearch** - Removed the Claude Code user agent restriction so WebSearch tool arguments flow for all clients
  * **Responses Streaming Errors** - Capture errors mid-stream in the Responses API so transport clients see failures instead of silent termination
  * **Anthropic Request Fallbacks** - Dropped fallback fields from outgoing Anthropic requests to avoid schema validation errors
  * **Tool Execution Header** - Remove redundant static header assignment in tool execution flow
  * **Virtual Key Configs** - Virtual key configurations cleaned up correctly on provider changes; fix key creation and management edge cases
  * **Virtual Key Management** - Fix virtual key creation validation and update handling
  * **vLLM Extra Params** - Extra parameters now properly passed through to vLLM providers
  * **OAuth Query Params** - Preserve existing query parameters when building OAuth upstream authorize URLs
  * **Streaming Timeouts** - Separate streaming clients per provider to prevent read timeout collisions
  * **Plugin Timer Concurrency** - Fix concurrent map access in plugin timer causing potential race conditions
  * **Async Context Propagation** - Preserve context values in async requests so downstream handlers retain request-scoped data
  * **Custom Providers** - Allow custom providers without a list-models endpoint to accept any model rather than restricting on virtual key registration
  * **OTel Insecure Default** - OTel plugin now defaults `insecure` to true when omitted, enabling HTTP collectors without explicit config; OTel semconv updated to v1.40.0
  * **Helm mcpClientConfig** - Fixed templating for `mcpClientConfig` (thanks [@crust3780](https://github.com/crust3780)!)
  * **Helm Chart** - Refreshed helm chart with validation fixes
</Update>

<Update label="Core" description="1.5.3">
  * feat: claude-opus-4-7 compatibility with adaptive thinking, task-budgets beta header, display parameter handling, and xhigh effort mapping
  * feat: add Anthropic structured output and response\_format support across chat completions and Responses API (thanks [@emirhanmutlu-natuvion](https://github.com/emirhanmutlu-natuvion)!)
  * feat: preserve MCP tool annotations in bidirectional conversion between MCP tools and Bifrost chat tools
  * feat: expand Anthropic chat schema and Responses converters to surface server-side tools (web search, code execution, computer use containers)
  * feat: add OCR request type support with stream terminal detection and full body accumulation for passthrough streams
  * feat: add user agent detection for multiple user agents and fix tool call reduplication
  * feat: virtual key provider and MCP configs are now deny-by-default; empty configs block all access
  * fix: make provider config weight optional; null weight excludes provider from weighted routing
  * fix: use separate streaming clients per provider to prevent read timeouts
  * fix: concurrent map access in plugin timer
  * fix: extra params passthrough for vllm providers
  * fix: remove redundant static header assignment in tool execution
  * fix: add OCR request pricing support
  * fix: usage of per-user OAuth servers in codemode
  * fix: adds validation on direct api keys
  * fix: OpenAI provider - flatten array-form tool\_result output for Responses API (thanks [@martingiguere](https://github.com/martingiguere)!)
  * fix: Gemini provider - handle content block tool outputs in Responses API path (thanks [@tom-diacono](https://github.com/tom-diacono)!)
  * fix: case-insensitive anthropic-beta merge in MergeBetaHeaders
  * fix: Bedrock provider - emit message\_stop event for Anthropic invoke stream (thanks [@tefimov](https://github.com/tefimov)!)
  * fix: Bedrock provider - preserve image content in tool results for Converse API (thanks [@Edward-Upton](https://github.com/Edward-Upton)!)
  * fix: gemini preserves thinkingLevel parameters during round-trip and corrects finish reason mapping
  * fix: WebSearch tool argument handling for all clients by removing Claude Code user agent restriction
  * fix: capture responses streaming API errors
  * fix: delete fallbacks from outgoing Anthropic requests
  * fix: token usage for vllm streaming (treat delta.content="" same as nil)
  * fix: provider queue shutdown panic - eliminated send on closed channel by leaving channels open and exiting via done signal
</Update>

<Update label="Framework" description="1.3.3">
  * feat: add team budget system with per-team spending tracking, DB tables, and atomic ratelimit integration
  * feat: add access profile filter to exclude access-profile-managed virtual keys
  * feat: add OCR input logging and pricing metadata support
  * feat: add tiered and priority/flex pricing support - 272k token tier fields, 200k priority variants, and tier selection based on service\_tier in responses
  * fix: use separate DB connection for migrations to prevent connection conflicts
  * fix: preserve existing query params in OAuth upstream authorize URL
  * fix: clean up virtual key configs when provider changes
  * fix: calendar\_aligned propagation in v1.5.0-prerelease4 migration
  * fix: virtual key creation and management handling
  * fix: preserve context values in async requests
  * fix: capture responses streaming API errors
  * fix: allow custom providers without a list models endpoint to register any model
  * fix: don't mark OAuth config expired on transient refresh failures
  * fix: only treat invalid\_grant and unauthorized\_client as permanent OAuth errors
</Update>

<Update label="compat" description="0.1.2">
  * feat: add chat-to-responses conversion for models that only support the Responses API
  * refactor: integrate model catalog to determine per-model conversion requirements
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="governance" description="1.5.3">
  * feat: add team budget support with per-team spending tracking and DB tables
  * feat: atomic budget and ratelimit update operations for concurrent safety
  * refactor: budget DB table restructure to support team budgets
  * fix: allow custom providers without a list models endpoint to pass in any model
</Update>

<Update label="jsonparser" description="1.5.3">
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="logging" description="1.5.3">
  * feat: add OCR input logging with request type metadata and detail view
  * fix: handle stream terminal detection in logging operations
  * fix: capture responses streaming API errors
</Update>

<Update label="maxim" description="1.6.3">
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="mocker" description="1.5.3">
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="otel" description="1.2.3">
  * fix: update OTel semconv from v1.39.0 to v1.40.0
  * fix: default insecure to true when omitted so HTTP collectors work without explicit config
  * fix: include fallbacks in emitted OTel metrics
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="prompts" description="1.0.3">
  * refactor: Updates prompt plugin flow to change the headers used, and better code quality
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="semanticcache" description="1.5.3">
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>

<Update label="telemetry" description="1.5.3">
  * chore: upgraded core to v1.5.3 and framework to v1.3.3
</Update>