AIchitect
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123 tools · 10 stacks
GitHub

AI tools are all over the place. This is the full landscape — 123 tools across 12 categories, mapped and connected. Ready to narrow it down? Build your stack →

Stack Layers
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?
React Flow mini map
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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
—
Stars
—
⭐ 93,000

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.

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 (8)

CrewAIAutoGenLlamaIndexLiteLLMPortKeyLangfuseAnthropic APIVercel AI SDK

Only OpenAI API (13)

LangChainMastraPydanticAIsmolagentsAgnoHeliconeMistral APICohere API

Only LangChain (16)

OpenHandsLangGraphSemantic KernelLangSmithQdrantChromaPineconeWeaviate
See full comparison in Explore →