These tools integrates with

OpenAI APIvsLangfuse

GPT-4o, o1, and embeddings from OpenAI versus OSS LLM engineering platform

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Choose OpenAI API when…

  • •You need the broadest ecosystem and most integrations
  • •GPT-4 or o-series reasoning models are required
  • •Assistants API, fine-tuning, or batch API are needed

Choose Langfuse when…

  • •You want open-source LLM observability
  • •Self-hosting your tracing stack is important
  • •You need cost tracking across models and users

Side-by-side comparison

Field
OpenAI API
Langfuse
Category
LLM Infrastructure
LLM Infrastructure
Type
Commercial
Open Source
Free Tier
✗ No
✓ Yes
Pricing Plans
API: Per token
Cloud: $59/mo
GitHub Stars
—
⭐ 7,000

OpenAI API

API access to GPT-4o, o1, and other OpenAI models including embeddings and image generation. The most widely used LLM API in production.

Website ↗

Langfuse

Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with clean UX.

Website ↗GitHub ↗

Shared Connections12 tools both integrate with

CrewAIAutoGenLangChainLlamaIndexMastraAgnoLiteLLMPortKeyHeliconeVercel AI SDKPromptFooDeepEval

Only OpenAI API (9)

PydanticAIsmolagentsLangfuseAnthropic APIMistral APICohere APIGroqTogether AIStainless

Only Langfuse (15)

CursorClaude CodeOpenHandsLangGraphDifyLangSmithRAGASOpenAI APIBraintrustArize Phoenix

Explore the full AI landscape

See how OpenAI API and Langfuse fit into the bigger picture — 123 tools, 304 relationships, all mapped.

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