Changelog

Tag teammates with @mentions to notify them instantly, and add emoji reactions to comments for quick acknowledgments.

Use slashes in dataset names to create folders for better organization.

Langfuse SDKs now support Langchain v1 for both Python and JS/TS. The integration remains stable and backward compatible.

Add human annotations while reviewing experiment results side-by-side. Review experiment outputs, assign scores, and leave comments while viewing full experiment context.

Every LLM-as-a-Judge evaluator execution now creates a trace, allowing you to inspect the exact prompts, responses, and token usage for each evaluation.

The traces endpoint in public API now supports complex JSON-based filtering.

Monitor your organization's cloud spending and receive notifications when costs exceed predefined monetary thresholds.

Filter your traces using plain English queries. Powered by AWS Bedrock with zero data retention.

Enforce JSON schema response formats in prompt experiments to ensure consistent, parseable outputs for evaluation and analysis.

Score configurations can now be updated after creation. Modify existing configs via API/SDK and UI while keeping all your data safe.

New high-level SDK abstraction for running experiments on datasets with automatic tracing, concurrent execution, and flexible evaluation.

The new OpenTelemetry-based TypeScript SDK v4 is now generally available with improved DX, modular packages, and seamless integrations.

New observation types including Agent, Tool, Chain, Retriever, Evaluator, Embedding, and Guardrail provide semantic meaning to your traces.

We've released new comprehensive walkthrough videos covering observability, prompt management, and evaluation to help you get up to speed quickly with Langfuse.

Find dataset items by searching through their actual content with our new full-text search capability

Set additional provider options in your LLM calls in playground and in llm-as-a-judge evaluations.

Append .md to any docs URL to fetch the page as Markdown. Built at compile time for fast, reliable access.

Day 1 support for OpenAI GPT-5 including tracking token counts and USD spend.

Assign users to annotation queues to make it easier for team members to focus on relevant tasks.

Receive prompt change notifications directly in your Slack channels with our native integration.

The LLM Playground now supports side-by-side prompt comparison with parallel LLM execution.

Annotation Queues now support session-level annotation, making it easier to evaluate multi-turn interactions in your LLM applications.

Trace real-time voice AI agents and multimodal conversations built with LiveKit Agents via OpenTelemetry and Langfuse

Enable non-technical users to trigger external experiment pipelines directly from the Langfuse UI on datasets.

Find prompts by searching through their actual content with our new full-text search capability

Self-hosted deployments can now use the AWS SDK default credential provider chain for Amazon Bedrock LLM connections.

Get real-time notifications for new prompt versions, changes to deployment labels or tags, and other edits.

Use Langfuse's prompt management capabilities directly in your n8n workflows to build powerful no-code agents.

Langfuse says hello to Gemini 2.5 Pro (GA), Gemini 2.5 Flash (GA), and Gemini 2.5 Flash Lite (Preview). Support added for the LLM playground, evaluations, and cost tracking.

Inject context or message history into your chat prompts at just the right spot.

Analyze multi-dimensional data with the new pivot table widget in Langfuse custom dashboards.

Now it is easier to find prompts in prompt management via the new search bar

Visualize data distributions with the new histogram chart type in Langfuse custom dashboards.

Integrate Langfuse into your existing codebase using AI agents like Cursor, Claude Code, GitHub Copilot, and Windsurf. Powered by the new Langfuse Docs MCP server.

Simplified JSON handling in prompts designated for LangChain consumption - no more extra escaping required.

Datasets and Audit Logs can now be exported as CSV and JSON directly from the UI.

Download metrics from any chart in your custom dashboards as CSV files for further analysis and reporting.

Use slashes in prompt names to create folders for better organization.

Langfuse adds same day support for OpenAI's o3-pro model and updated o3 pricing

The OpenTelemetry-based Python SDK v3 is now stable and ready for production use.

We have Open Sourced all Remaining Product Features under the MIT License

Trace realtime audio agents built with Pipecat via OpenTelemetry and Langfuse

Introducing the Langfuse Evaluator Library with prebuilt evaluators. Plus, enjoy a revamped UX with trace and variable previews for easier LLM evaluation.

The latest generation of the Langfuse Python SDK, built on the OpenTelemetry framework.

Langfuse says hello to Anthropic Claude Sonnet 4 & Opus 4 with day 1 support for both the LLM playground, LLM-as-a-judge and cost tracking.

Deploy Langfuse on AWS, GCP, or Azure using our new Terraform modules.

Create your own custom dashboards or use Langfuse-curated dashboards to analyze and understand your AI application deeply.

Pin your favorite table settings and share them with a single link.

Find content in inputs and outputs of your traces and observations with full text search.

Control which product modules are visible in the main menu through environment variables when self-hosting Langfuse