# Vertexai express mode API support in langchain

**URL:** https://forum.langchain.com/t/vertexai-express-mode-api-support-in-langchain/2108
**Category:** LangChain
**Tags:** python-help
**Created:** [November 5, 2025, 5:01pm UTC](https://forum.langchain.com/t/vertexai-express-mode-api-support-in-langchain/2108 "2025-11-05T17:01:24Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![satriya-adhim](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/satriya-adhim/32/1497_2.png) [@satriya-adhim](https://forum.langchain.com/u/satriya-adhim)
#### Post date: [November 5, 2025, 5:01pm UTC](https://forum.langchain.com/t/vertexai-express-mode-api-support-in-langchain/2108/1 "2025-11-05T17:01:24Z")

</div>

I want to ask is langchain (either langchain\_google\_genai or langchain\_google\_vertexai) supported to use API of vertexai express mode already? Because I can’t find it in the documentation.  
According to vertexai documentation ([https://docs.cloud.google.com/vertex-ai/generative-ai/docs/start/express-mode/vertex-ai-express-mode-api-quickstart](https://docs.cloud.google.com/vertex-ai/generative-ai/docs/start/express-mode/vertex-ai-express-mode-api-quickstart)) we can use Vertex ai express mode api to use the LLM.  
Thank you.