Home / Compare / LangChain Docs vs OpenAI Docs
LangChain Docs vs OpenAI Docs MCP server
Verdict from our tests: OpenAI Docs passed more of our tasks (7 of 7) than LangChain Docs (5 of 6). Both are in our documentation and docs search category.
| LangChain Docs | OpenAI Docs | |
|---|---|---|
| Overall | Partial | Works |
| Tasks passed | 5 of 6 | 7 of 7 |
| Sign-in | None | None |
| Median task time | 182 ms | 284 ms |
| Slowest task | 496 ms | 482 ms |
| Gotchas | 2 | 1 |
| Date tested | Oct 16, 2026 | Oct 16, 2026 |
LangChain Docs: task by task
- Works connect (no auth) (427 ms)
- Works list tools (182 ms)
- Works search docs ("LangGraph checkpointer") (467 ms)
- Works browse docs filesystem (ls /) (114 ms)
- Partial search with nonsense query (496 ms)
- Works error handling (number as query) (78 ms)
LangChain Docs gotchas
- Search results are large (about 52 KB for one query).
- A nonsense query returned about 108 KB of unrelated docs instead of an empty result.
Set up LangChain Docs: Claude | Claude Code | Cursor | VS Code | ChatGPT
OpenAI Docs: task by task
- Works connect (no auth) (482 ms)
- Works list tools (186 ms)
- Works search docs ("Responses API streaming") (320 ms)
- Works fetch a doc (Responses API streaming guide) (290 ms)
- Works list API endpoints (67 ms)
- Works search with nonsense query (284 ms)
- Works error handling (missing url) (47 ms)
OpenAI Docs gotchas
- list_api_endpoints returns about 25 KB of paths in one call.
Set up OpenAI Docs: Claude | Claude Code | Cursor | VS Code | ChatGPT
Best MCP servers for documentation and docs search | All tested connectors