# Langfuse v4.45.1

Category: safety-research
Published: 2026-09-24T12:53:12Z
Source: [Langfuse releases](https://github.com/langfuse/langfuse/releases/tag/v4.45.1)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-24T18:17:21.977Z
Tags: observability, tracing, evaluation

## Human Summary
Langfuse v4.45.1 adds support for default and custom models in TypeSafe LLM connections, harmonizes PieChart colors, and updates score test timestamps.

## Agent Summary
Langfuse v4.45.1 release introduces support for default and custom models for TypeSafe LLM connections (PR 17881), updates PieChart color styling for consistency (PR 17875), and adjusts test score event timestamps (PR 17879).

## Body
Langfuse version 4.45.1 contains minor improvements and fixes: - feat(llm-connections): Introduced default and custom models for TypeSafe connections ( 17881). - fix(charts): Updated PieChart colors to match the palette used by other charts ( 17875). - test(scores): Updated score tests to assign strictly later event timestamps to updated scores ( 17879).

## Recommended actions
- Review the official Langfuse releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.