Langfuse Python Version. Works with any LLM or framework - Releases · langfuse/lan

Works with any LLM or framework - Releases · langfuse/langfuse-python. Not able to see Langflow components inputs and outputs in Langfuse tracing. Updates between minor/patch versions can be applied automatically. You can also Open Source LLM Observability and Tracing with Langfuse. 4, which includes a fix for this bug. langfuse. 5 annotated-doc 0. I tried setup LangFlow and Langfuse in on-prem(self-hosted) with docker. Replay the entire interaction to debug or analyze the conversation. This module provides the core experiment functionality for the Langfuse Python SDK, allowing users to run experiments on datasets with automatic tracing, evaluation, and result formatting. 0 anthropic 0. datasets. Langfuse is an open source LLM engineering platform. Self-host Langfuse - This guide shows you how to deploy open-source LLM observability with Docker, Kubernetes, or VMs on your own infrastructure. I need help because for some reason I can't get my agent to work with python version 3. Access via SDKs Both the Langfuse Python SDK and the JS/TS SDK provide a strongly-typed wrapper around our public REST API for your convenience. For major versions, please refer to the migration guides. 7 aiohappyeyeballs 2. Lang 1 day ago · Describe the bug I am creating an agent using PydanticAI. 1 aiohttp 3. 15 aiormq 6. 1# This file was auto-generated by Fern from our API Definition. 3856version (int): The version number of the prompt to update. Jan 13, 2026 · [!IMPORTANT] The SDK was rewritten in v3 and released in June 2025. Learn how to use Langfuse for open source observability/tracing in your LangGraph application (Python). Get started with Langfuse Prompt Management. Traces, evals, prompt management and metrics to debug and improve your LLM application. 🪢 Langfuse Python SDK - Instrument your LLM app with decorators or low-level SDK and get detailed tracing/observability. 1 Required dependencies: backoff | httpx | openai | opentelemetry-api | opentelemetry-exporter-otlp-proto-http | opentelemetry-sdk | packaging | pydantic | requests | wrapt Traces, evals, prompt management and metrics to debug and improve your LLM application. experiment Langfuse experiment functionality for running and evaluating tasks on datasets. lock`, and th This is a known limitation with Python's context propagation: when you use ProcessPoolExecutor, each process gets its own memory space, so contextvars (used by the Langfuse Python SDK to track trace context) do not automatically propagate. Please see our docs for detailed information on this SDK. metrics. Labels are unique across versions. 3. 🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Instead, upgrade directly to version 1. We recommend automated updates within a major version to benefit from the latest features, bug fixes, and security patches (docker pull langfuse/langfuse:2). Dec 12, 2025 · The Langfuse Python SDK is an observability and analytics platform for Large Language Model (LLM) applications. For more information about OpenTelemetry support in Langfuse, see the official Langfuse OpenTelemetry documentation. . 🕵️‍♂️ Langfuse: the LLM engineering platform. 3v2. 🍊YC W23 - Releases · langfuse/langfuse. What is Langfuse? Hi. js:2655:68) langfuse. resourcesimport( 4AccessDeniedError, 5AnnotationQueue, 6AnnotationQueueAssignmentRequest, 7AnnotationQueueItem, 8AnnotationQueueObjectType, 9AnnotationQueueStatus, 10ApiKeyDeletionResponse, 11ApiKeyList, 12ApiKeyResponse, 13ApiKeySummary, 14AuthenticationScheme Versioning Versioning is key to ensure compatibility between Langfuse Server, SDKs, and custom integrations via the Public API. 12. Comprehensive API: Langfuse is frequently used to power bespoke LLMOps workflows while using the building blocks provided by Langfuse via the API. 1 aio-pika 9. Scope of semantic versioning The following changes result in a major version bump as they are considered breaking: Infrastructure changes Removal of existing Public APIs or removal/changes of existing parameters from Public Drop-in replacement of OpenAI SDK (Python) to get full observability in Langfuse by changing only the import. 16. g. daily langfuse. Explore the HTTP API endpoints with detailed information on operations, parameters, and responses. Jun 5, 2025 · Following extensive testing and community feedback, we’re excited to announce that Langfuse Python SDK v3 is now generally available and ready for production use. com or your own instance to see your generation. 0 aiosignal 1. Langfuse Prompt Management helps to version control and manage prompts collaboratively in one place. The SDK requires authentication credentials and supports extensive configuration through environment variables or constructor parameters. Not seeing what you expected? I'm not seeing the latest version of my prompt. batch langfuse. 5 days ago · How Langfuse Uses OpenTelemetry The latest Langfuse SDKs (Python SDK v3+ and JS SDK v4+) are built on OpenTelemetry (OTEL). Example of Open Source Prompt Management for Langchain applications using Langfuse. 10 and introduces full compatibility with Langchain v1 pip install langfuse-langchain ==2. Open source tracing and monitoring for your LangChain application. 8. health langfuse. , span, generation, event, and other observation types). 2 and now I have this issue. 4. This system enables teams to manage prompt templates with version control, cach Jan 12, 2026 · Describe the bug When using Strands Agents' Swarm functionality, the system prompt of individual agents is omitted in Langfuse traces. Works with any LLM or framework - langfuse/langfuse-python The Langfuse SDK prompt cache is invalidated for all prompts witht he specified name. was able to handle with previous version. But It looks like langflow is not sending trace logs to langfuse. Jul 25, 2025 · The Prompt Management System provides centralized storage, versioning, and distribution of prompts for LLM applications. Use native integrations or custom instrumentation patterns in Python and JavaScript/TypeScript to capture rich traces. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects. 0 If Langfuse Cloud No response SDK and integration versions Package Version Editable project location agno 1. Langfuse integrates with various tools and frameworks, including workflow builders and runtimes like Langflow. Python and JS/TS. Observability, evals, prompt management, playground and metrics to debug and improve LLM apps Jan 10, 2026 · This page provides detailed technical reference information about the claude-code-gpt-5 codebase, focusing on the underlying technical infrastructure, dependency management, and project organization. Learn how to trace and monitor Instructor API calls using Langfuse for comprehensive observability in your LLM applications. 3 have a critical bug where . Aug 29, 2025 · For legacy Python SDK v2, you can use the snapshot at https://python-sdk-v2. 10. Observability, evals, prompt management, playground and metrics to debug and improve LLM apps - langfuse/langfuse-docs Apr 17, 2025 · A client library for accessing langfuse with open telemetry trace_id Traces, evals, prompt management and metrics to debug and improve your LLM application. Automatically capture rich traces and metrics and evaluate outputs. Use Log Levels to control the verbosity of your logs and highlight errors and warnings. Documentation for the legacy Python SDK v2 can be found here. Oct 8, 2025 · As of SDK version 1. This Python notebook includes a number of examples of how to use the Langfuse SDK to query data. Production via Docker. 2. It captures all details of your LLM workflows — inputs … Oct 2, 2025 · As I am upgrading my Langfuse Python SDK to the latest version 3. toml`, dependency locking via `uv. other than this update I did not do any code changes or anything. We follow semantic versioning for Langfuse releases, i. 0 anyio 4 🪢 Langfuse documentation -- Langfuse is the open source LLM Engineering Platform. Following is my configuration. 4 annotated-types 0. May 23, 2025 · We're introducing the Langfuse Python SDK v3 (OpenTelemetry-based) in beta. Use Langfuse Datasets to create structured experiments to test and benchmark LLM applications. prompts. Documentation for the legacy TypeScript SDK v3 can be found here. Optionally switch to our new integrations: Since the first major version, we built many new ways to integrate your code with Langfuse such as Decorators for Python. env files for configuration. 0 alembic 1. Jan 29, 2024 · Update openapi spec Generate Fern Python SDK in langfuse and copy the files generated in generated/python into the langfuse/api folder in this repo. Responsibilities: host Langfuse, central MCP services (if not serverless), operator tasks This documentation is for the latest versions of the Langfuse SDKs. e. These need to be passed to all application containers. When using system OpenTelemetry integration for Langfuse, the open-source LLM observability platform. Cookbook with examples of the Langfuse Integration for Langchain (Python). You can configure the integration via (1) constructor arguments or (2) environment variables. Thus, we take semantic versioning seriously. Additionally, you can assign labels to follow your own versioning scheme. Feel like something is missing? Add new ideas on GitHub or vote on existing ones. env files are not read, potentially causing security vulnerabilities. We then enabled instrumentation in our sample LLM application using Langfuse Python SDKs. Langflow versions 1. Why you’ll love it: Unified context propagation: Automatically nests spans and generations, even across threads or async tasks. github. For instance, for a given component, you will see the component python code instead of the input data. Thereby, you can track the effect of a new version on the metrics of an object with a specific name using Langfuse analytics. All data in Langfuse is available via API. This allows you to log, analyze and debug your LangChain application. com/colaboratory-static/common/239d6c25570eaf6dd9514e532933ee3b/external_binary. Instead, upgrade to 1. Langfuse (open source) helps you trace and analyze LLM applications. 5. I want to use PydanticAI's instructions argument instead of system_prompt, but when using instructions the prompt is not showing up in Langfuse generation spans. Refer to the v2 migration guide for instructions on updating your code. breaking changes are only introduced in a new major version. Execute the linter by running poetry run ruff format . The version parameter can be added to all observation types (e. Learn how LangSmith improves the reliability, observability, and performance of AI applications. It provides instrumentation, tracing, evaluation, prompt management, and dataset experimentation capabilities for production LLM systems. Migrate from Python SDK v2 → v3 and TypeScript SDK v3 → v4 with side-by-side guides. Rebuild and deploy the package to PyPi. gstatic. Observability, evals, prompt management, playground and metrics to debug and improve LLM apps CustomError: Could not find python_sdk_low_level. To use the Langfuse SDK for prompt management and evaluation, visit their respective documentation. @marcklingen @hassiebp Updating from the langfuse python sdk 3. dataset_items. When you initialize Langfuse, it registers by default a span processor that captures trace data and sends it to Langfuse. Our requirement is to allow non-technical team members (such as PMs or QA engineers) to trigger this GitHub Action directly from the Langfuse UI whenever they add or update datasets in Langfuse UI. 3, Langfuse supports both Pydantic v1 and v2, which resolves incompatibilities with projects using Pydantic v2, but there is no official documentation or changelog entry confirming Python 3. This example demostrates how to use prompts managed in Langchain applications. 0 package since version 2. GitHub is where people build software. 0. Self-host Langfuse: Run Langfuse on your own infrastructure. 7. 1, I am updating the CallbackHandler for enabling tracing in my LangGraph solution. Get started with LLM observability with Langfuse in minutes before diving into all platform features. Debug, analyze and iterate together - 🍊YC W23 🤖 Stable SDKs + integrations for Typescript, Python, OpenAI, Langchain, Litellm, Flowise, Superagent and Langflow - kalufinnle/langfuseObservability } Langfuse Cloud or Self-Hosted? Langfuse Cloud If Self-Hosted 3. This is a significant update to our Python SDK as it is now built on the OpenTelemetry (OTEL) standard and designed to im python. 3857new_labels (List[str], optional): New labels to assign to the prompt version. docs-snapshot. 🪢 Langfuse Python SDK - Instrument your LLM app with decorators or low-level SDK and get detailed tracing/observability. 5 days ago · We currently have a GitHub Action pipeline that downloads datasets from Langfuse and runs Python-based experiments. DO NOT upgrade to these versions if you use . 🪢 Open source LLM observability, analytics, prompt management, evaluations, tests, monitoring, logging, tracing, LLMOps. It creates Langfuse observations (spans or generations) around function execution, capturing timing, inputs, Step-by-step guide to run Langfuse on Kubernetes via Helm. 38533854Args:3855name (str): The name of the prompt to update. Dec 12, 2025 · The `@observe` decorator provides automatic tracing and observability for Python functions. Apr 16, 2025 · A client library for accessing langfuse with open telemetry trace_id Aug 2, 2025 · Langfuse Tracing Tutorial: Integrating with LangChain and OpenAI Langfuse is an open-source observability platform for LLM applications. Oct 28, 2025 · A client library for accessing langfuse Why should you use this library? This library builds upon Langfuse v2. Integrates with OpenAI, LlamaIndex, LangChain, Python Decorators and more. May 31, 2025 · 🔭 Python SDK v3 is now Generally Available Following extensive testing and community feedback, we’re excited to announce that Langfuse Python SDK v3 is now generally available and ready for production use. 4 -> 3. 60 stopped working. dataset_run_items. So I could say async tasks etc. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 1 Langfuse Python SDK Installation [!IMPORTANT] The SDK was rewritten in v2 and released on December 17, 2023. create langfuse. 0 through 1. 1. The Langfuse integration will parse these attributes. This documentation is for the latest versions of the Langfuse SDKs. Versions & Labels Each prompt version is automatically assigned a version ID. 2 3from. Langfuse Roadmap Langfuse is open source and we want to be fully transparent what we’re working on and what’s next. 14 support or a migration plan specifically for this version yet. get langfuse. Your feedback is highly appreciated. langchain. Track LLM chat conversations or threads across multiple observations and traces into a single session. 9. com/docs/observability/sdk/python/decorators or the Internet Archive if needed. create Environment Variables Langfuse (self-hosted) has extensive configuration options via environment variables. Get your Langfuse credentials by signing up at cloud. langfuse. create. This roadmap is a living document and we’ll update it as we make progress. Dec 9, 2024 · Langfuse v3 is now stable and ready for production use when self-hosting Langfuse, including many scalability and architectural improvements. Link to trace in Langfuse Langfuse Features (User, Tags, Metadata, Session) You can access additional Langfuse features by adding the relevant attributes to the OpenAI request. Refer to the v3 migration guide for instructions on updating your code. Aug 25, 2025 · We implemented Monitoring and Observability using Langfuse—an open-source framework, offering free and enterprise solutions. observations. This crate provides OpenTelemetry components and utilities for integrating with Langfuse, enabling comprehensive observability for LLM applications. It provides tracing and monitoring capabilities for AI applications, helping developers debug, analyze, and optimize their AI systems. Comprehensive API reference for Langfuse services. Why? Next steps Now that you’ve used your first prompt, there are a couple of things we recommend you do next to make the most of Langfuse Prompt Management: Link prompts to traces to analyze performance by prompt version Use version control and labels to manage Prompt Version Control In Langfuse, version control & deployment of prompts is managed via versions and labels. 3 days ago · Bug Description Hello. 60. You can use your editor’s Intellisense to explore the API methods and their parameters. It includes observability, analytics, and experimentation features. Go to https://cloud. Dec 12, 2025 · This page documents the installation process and configuration options for the Langfuse Python SDK. OpenAPI spec, Postman collection, and typed SDKs for Python, JS/TS are available. The API methods are accessible via the api property on the Langfuse client instance in both SDKs. get_runs langfuse. 🪢 Langfuse documentation -- Langfuse is the open source LLM Engineering Platform. completions. com/repos/langfuse/langfuse-docs/contents/cookbook?per_page=100&ref=main at new RN (https://ssl. Langfuse is an open-source platform for LLM observability. Most broken links are due to a recent restructuring of documentation URLs (PR #8552). 6 · langfuse/langfuse-python DO NOT upgrade to version 1. The piwheels project page for langfuse: A client library for accessing langfuse Langfuse Cloud: A fully managed version of Langfuse that is hosted and maintained by the Langfuse team. End-to-end example of creating a dataset, adding items, and running experiments with Langfuse datasets. Works with any LLM or framework langfuse decorators langfuse pydantic pydantic-v2 4 days ago · Purpose: Central control for stateful services (Langfuse, internal tooling) and cross-agent governance. The integration remains stable and backward compatible. com Redirecting Oct 26, 2025 · Langfuse SDKs now support Langchain v1 for both Python and JS/TS. Opting for the self-hosting solution, we set up Langfuse dashboard using docker file along with PostgreSQL server for persistence. Domain experts can document what the model should have generated, creating a foundation for fine-tuning datasets and continuous improvement. com or self-hosting Langfuse. Works with any LLM or framework - Comparing v2. health. chat. Steps to reproduce I have attached the agent's Python script, 6 days ago · Corrected Outputs Corrections allow you to capture improved versions of LLM outputs directly in trace and observation views. Jan 10, 2026 · This page documents the dependency management system used in claude-code-gpt-5, including the `uv` package manager, dependency declaration in `pyproject. For more details, please refer to the configuration guide. 66. 4 days ago · Debug, trace, and evaluate LLM agents with LangSmith. 11. get_many langfuse. ingestion. ipynb in https://api. Learn how traces and observations are structured in Langfuse. Dec 12, 2025 · Langchain v1 Support Langfuse SDKs now support Langchain v1 for both Python and JS/TS. Integrates with Langchain, OpenAI, LlamaIndex, LiteLLM, and more. 6. I use my own OpenAI BaseUrl and hence created a httpx client with my certs. Publish release poetry version patch poetry version prepatch for pre-release versions poetry install Langfuse is a platform for observing and debugging large language model applications with features like tracing, metrics, and integrations. pip This documentation is for the latest versions of the Langfuse SDKs. Features Langfuse supports many configuration options and self-hosted features. projects. This major release brings the power of OpenTelemetry (OTEL) to LLM observability, providing a more robust and standards-compliant foundation for tracing your AI applications. Please follow the deployment guide for more details and detailed instructions on how to deploy Langfuse on various cloud providers. Previously, I simply had a list of messages after doing all the conversation with LLM and simply sent them to LangFuse using langfuse_client. Use this guide to keep your Langfuse deployment up to date. Latest version: 3.

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