These tools integrates with

OpenAI APIvsDeepEval

GPT-5 era models, embeddings, and Responses API from OpenAI versus LLM evaluation framework — 14+ metrics

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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 DeepEval when…

  • •You want a pytest-style framework for LLM testing
  • •Unit-test-like evals for LLM outputs fit your workflow
  • •You need RAG-specific metrics like faithfulness and relevancy

Side-by-side comparison

Field
OpenAI API
DeepEval
Category
LLM Infrastructure
Prompt & Eval
Type
Commercial
Open Source
Free Tier
✗ No
✓ Yes
Pricing Plans
API: Per token
—
GitHub Stars
—
⭐ 5,500
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 ↗

DeepEval

Open-source evaluation framework with 14+ metrics including faithfulness, relevancy, and hallucination detection. Integrates with CI/CD.

Website ↗GitHub ↗

Shared Connections3 tools both integrate with

LangfusePromptFooGalileo

Only OpenAI API (36)

CrewAIAutoGenLlamaIndexLangChainPydanticAIsmolagentsAgnoMastraLiteLLMPortKey

Only DeepEval (4)

RAGASOpenAI APITruLensInspect

Explore the full AI landscape

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

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