[Fix] 404 Not Found on /api/event_logging/batch endpoint

[ishaan-jaff]

[Fix] 404 Not Found on /api/event_logging/batch endpoint

fixes: #19740

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Type

🐛 Bug Fix
✅ Test

Changes

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Feb 5, 2026 6:24pm

[greptile-apps]

Greptile Overview

Greptile Summary

This PR fixes 404 errors from Claude Code clients by adding a stubbed /api/event_logging/batch endpoint that accepts telemetry data but doesn't process it.

Key changes:

• Added event_logging_batch() endpoint in litellm/proxy/anthropic_endpoints/endpoints.py that returns {"status": "ok"}
• Added _last_semantic_filter_config field to ProxyConfig class for caching semantic filter configuration
• Added OpenRouter Qwen3-235B model configurations to model pricing data

The new endpoint is lightweight and follows the existing pattern of stubbed endpoints. The implementation correctly avoids creating database objects or Router instances in the request path.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are straightforward and low-risk: a simple stubbed endpoint that returns a static response, a caching field addition, and model configuration updates. No logic changes to existing functionality.
• No files require special attention

Important Files Changed

Filename	Overview
litellm/proxy/anthropic_endpoints/endpoints.py	Added stubbed /api/event_logging/batch endpoint to prevent 404 errors from Claude Code clients
litellm/proxy/proxy_server.py	Added _last_semantic_filter_config field to cache semantic filter configuration

Sequence Diagram

sequenceDiagram
    participant Client as Claude Code Client
    participant Proxy as LiteLLM Proxy
    participant Router as Anthropic Router
    participant Endpoint as event_logging_batch

    Client->>Proxy: POST /api/event_logging/batch
    Note over Client: Sends telemetry data
    Proxy->>Router: Route request
    Router->>Endpoint: Handle event_logging_batch()
    Note over Endpoint: Stubbed endpoint<br/>No processing
    Endpoint-->>Router: {"status": "ok"}
    Router-->>Proxy: Return response
    Proxy-->>Client: 200 OK {"status": "ok"}
    Note over Client: No 404 error

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[greptile-apps]

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