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

CrewAIAutoGenLlamaIndexLangChainAgnoMastraLiteLLMPortKeyHeliconeVercel AI SDKPromptFooDeepEval

Only OpenAI API (27)

PydanticAIsmolagentsLangfuseAnthropic APIMistral APICohere APIGroqTogether AIManus AIStainless

Only Langfuse (19)

Claude CodeCursorLangGraphOpenHandsDifyLangSmithRAGASOpenAI APIBraintrustArize Phoenix

Explore the full AI landscape

See how OpenAI API and Langfuse fit into the bigger picture — 235 tools, 543 relationships, all mapped.

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