# Langfuse: what AI models say (September 2026)

Source: Memetik Index, https://www.memetik.ai/vendors/langfuse
Website: https://langfuse.com

Langfuse was named in 48 of 50 AI answers across 1 category. Best position: LLM observability and evals, 96% answer share, ranked #2, named first in 50%.

## What Langfuse is

Langfuse is an open platform for tracing, evaluating and improving AI agents. It is for people developing LLM applications, including product managers, domain experts and engineers. A free account is available.

It uses production data to help users understand agent behaviour. Langfuse provides central storage, versioning and retrieval for prompts used in LLM applications. Non-technical team members can update prompts through the interface, while applications fetch the latest version. Its SDK also caches prompts on the client side.

Pricing: A free account is available.
(From Langfuse's own website, read 2026-09-02.)

## By category

| Category | Rank | Answer share | Named first | Models |
|---|---|---|---|---|
| LLM observability and evals (https://www.memetik.ai/index/llm-observability) | #2 of 13 | 96% | 50% | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude, Claude Fable 5, Gemini, Gemini 3.5 Flash, Perplexity, Sonar Reasoning Pro |

## What the models said

> "Practical recommendation If you have no strong existing constraints, start with Langfuse self-hosted, instrumented via OpenTelemetry."
> — Claude Opus 5, LLM observability and evals

> "Go with Langfuse if you want a powerful, clean, self-hostable open-source tracing and cost-monitoring UI."
> — Gemini 3.5 Flash, LLM observability and evals

> "Summary Recommendation Go with Langfuse or Comet Opik if you want an open-source, self-hostable platform with full control over your telemetry data."
> — Gemini, LLM observability and evals

> "Bottom line: use Langfuse as the default procurement choice; use Phoenix if open telemetry, self-hosting, and diagnostic depth are your strongest requirements."
> — ChatGPT, LLM observability and evals