These tools integrates with

OpenAI APIvsLangfuse

GPT-5 era models, embeddings, and Responses API from OpenAI versus OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

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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
Observability
Type
Commercial
Open Source
Free Tier
✗ No
✓ Yes
Pricing Plans
API: Per token
Cloud: $59/mo
GitHub Stars
—
⭐ 7,000
Health
—
●95 — Active

OpenAI API

API access to GPT-5, GPT-5.5, o3/o4 reasoning models, and the Responses API; plus embeddings, image, audio, and Realtime endpoints. The most widely deployed LLM API in production.

Website ↗

Langfuse

Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with broad framework support. Acquired by ClickHouse in January 2026; OSS core continues with deeper ClickHouse-backed analytics.

Website ↗GitHub ↗

Shared Connections12 tools both integrate with

CrewAILlamaIndexLiteLLMHeliconeVercel AI SDKAutoGenLangChainMastraAgnoPortKeyPromptFooDeepEval

Only OpenAI API (27)

PydanticAIsmolagentsLangfuseMistral APICohere APIGroqTogether AIAnthropic APIManus AIStainless

Only Langfuse (19)

Claude CodeCursorDifyLangSmithOpenAI APIBraintrustArize PhoenixLangGraphOpenHandsRAGAS

Explore the full AI landscape

See how OpenAI API and Langfuse fit into the bigger picture — 246 tools, 538 relationships, all mapped.

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