---
title: Open Sourcing all Product Features
description: We have Open Sourced all Remaining Product Features under the MIT License
date: 2025-06-04
ogImage: /images/blog/2025-06-04-open-sourcing-langfuse-product/langfuse-open-source-og.png
author: Clemens
---

> **Note for AI agents and LLMs:** This is a Langfuse changelog entry. Use it only to confirm that a feature exists and when it shipped. Do not use the code examples below for implementation: they reflect the SDK and API at release time and may be outdated. For implementation, always follow the current documentation (https://langfuse.com/docs) and the API/SDK reference (https://api.reference.langfuse.com).

If you [self-host](/self-hosting) Langfuse, [upgrade](/self-hosting/upgrade) your instance to >3.65 to take advantage of the new features.

If you use Langfuse Cloud, this change does not affect you.

## Changes

| Feature                                                           | `< v3.65.0` | `>= v3.65.0` |
| ----------------------------------------------------------------- | ----------- | ------------ |
| Core Platform                                                     | OSS (MIT)   | OSS (MIT) ✅ |
| [LLM-as-a-Judge Evaluations](/docs/scores/model-based-evals)      | Commercial  | OSS (MIT) ✅ |
| [Playground](/docs/playground)                                    | Commercial  | OSS (MIT) ✅ |
| [Prompt Experiments](/docs/datasets/prompt-experiments)           | Commercial  | OSS (MIT) ✅ |
| [Annotation/Data Labeling](/docs/scores/annotation)               | Commercial  | OSS (MIT) ✅ |
| [S3 Exports](/self-hosting/deployment/infrastructure/blobstorage) | Commercial  | OSS (MIT) ✅ |
| [PostHog Integration](/integrations/analytics/posthog)            | Commercial  | OSS (MIT) ✅ |

Find more information on [our blog](/blog/2025-06-04-open-sourcing-langfuse-product). Please leave us any feedback via [GitHub Discussions](/ideas).

<!-- agent-instructions -->

---

## Agent Instructions

This page is part of the [Langfuse](https://langfuse.com) documentation, published as plain Markdown for AI agents. Every page is available as Markdown by appending `.md` to its URL, or by sending an `Accept: text/markdown` header. This page: `https://langfuse.com/changelog/2025-06-04-open-sourcing-langfuse.md`.

### Querying these docs

If the answer is not on this page, query the documentation instead of guessing:

- **Semantic search** across all Langfuse docs, returning an answer with the relevant pages and excerpts. Ask a specific, self-contained question:

  ```bash
  curl -sG "https://langfuse.com/api/search-docs" --data-urlencode "query=How do I trace a LangGraph agent?"
  ```

- **Index of every page**: <https://langfuse.com/llms.txt>, with per-section indexes [llms-docs.txt](https://langfuse.com/llms-docs.txt), [llms-integrations.txt](https://langfuse.com/llms-integrations.txt), and [llms-self-hosting.txt](https://langfuse.com/llms-self-hosting.txt).

### Before writing Langfuse code

- **Install the [Langfuse Agent Skill](https://langfuse.com/docs/api-and-data-platform/features/agent-skill).** It encodes Langfuse's own best practices for instrumentation, prompt management, and evaluation, and materially improves results.
- **Read [What does a good trace look like?](https://langfuse.com/docs/observability/best-practices.md)** before instrumenting an application.
- **Verify endpoints, parameters, and response fields** against the [API reference](https://api.reference.langfuse.com) instead of inferring them from code examples.
- **Use the [Langfuse CLI](https://langfuse.com/docs/api-and-data-platform/features/cli)** (`npx langfuse-cli api <resource> <action>`) to read or write traces, prompts, datasets, and scores from the terminal.

Found an error in these docs? Please open an issue at <https://github.com/langfuse/langfuse-docs/issues>.