AIchitect
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235 tools · 33 stacks

AI tools are all over the place. This is the full landscape — 247 tools across 21 categories, mapped and connected. Ready to narrow it down? Build your stack →

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What are you building and how is it defined?
How do you write and ship code?
How does your AI think and act?
Which models and infrastructure power it?
How do you build, observe, and extend it?
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These tools integrates with
OpenAI API
vs
LangChain

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 LangChain when…

  • •You want a broad, flexible LLM orchestration toolkit
  • •You need integrations with many tools and data sources
  • •You're prototyping or exploring LLM app patterns
Field
OpenAI API
LangChain
Category
LLM Infrastructure
Pipelines & RAG
Type
SaaS
OSS
Free Tier
✗ No
✓ Yes
Plans
API: Per token
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Stars
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⭐ 93,000
Health
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●100 — Active
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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.

LangChain

Most widely used framework for building LLM applications. Chains, agents, RAG pipelines, and deep integrations with 300+ tools.

OpenAI API Website ↗
LangChain Website ↗GitHub ↗

Shared Connections (12)

CrewAIAutoGenLlamaIndexLiteLLMPortKeyLangfuseAnthropic APIVercel AI SDKFal.aiGalileoZepRAGFlow

Only OpenAI API (26)

LangChainMastraPydanticAIsmolagentsAgnoHeliconeMistral APICohere API

Only LangChain (21)

OpenHandsLangGraphSemantic KernelLangSmithQdrantChromaPineconeWeaviate
See full comparison in Explore →