# Langfuse v4.47.0

Category: safety-research
Published: 2026-09-29T08:25:01Z
Source: [Langfuse releases](https://github.com/langfuse/langfuse/releases/tag/v4.47.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-29T12:17:28.050Z
Tags: observability, tracing, evaluation

## Human Summary
Langfuse v4.47.0 introduces dedicated trace transcripts, NAPI batch encoding, a native ClickHouse write strategy for workers, and AI gateway enhancements.

## Agent Summary
Langfuse v4.47.0 adds trace transcripts rendering, NAPI-based JS event batch encoding, and a ClickHouse Native write strategy. AI Gateway updates include environment setting via langfuse-environment header, input capturing up to 5 MiB, and fixes to usage inference on failed generations.

## Body
Langfuse release v4.47.0 brings several key observability, ingestion, and infrastructure updates: - Observability & Transcripts : Added the ability to render and measure dedicated trace transcripts, exposed current turn nesting level in transcripts, and labeled experiment query outcomes for SLO tracking. - Worker & Ingestion Performance : Introduced NAPI batch encoding for JS events and added a ClickHouse Native write strategy to workers alongside refactoring of the ClickHouse JSON write strategy. - AI Gateway Updates : Supports setting trace environments using the langfuse-environment header, captures full-mode inputs up to 5 MiB with omitted input markers, and ceases inferring usage for failed or cancelled generations. - Pricing & Ingestion Fixes : Adjusted pricing logic for Anthropic 1-hour cache writes and OpenAI cache-write tokens.

## Recommended actions
- Upgrade Langfuse instances to v4.47.0.
- If using the AI Gateway, optionally supply the langfuse-environment header to tag trace environments automatically.
- Evaluate worker configurations if intending to use the new ClickHouse Native write strategy.

## 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.