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The Domesday Book ofKWJ · AI

OpenAI Assistants API vs LangChain

Assistants API for managed state without infrastructure; LangChain for full control.

OpenAI Assistants API
OpenAI's hosted agent runtime. Threads, tools, file search, code interpreter — managed for you.

Use this when

Fastest path to managed agent with file search and code interpreter.

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LangChain
The framework that defined agent chaining before 'agent' was a product category.

Use this when

Custom architecture, non-OpenAI models, fine-grained control.

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Cost comparison

Assistants adds storage; LangChain free + LangSmith addon.