Model Fallback Middleware (Python)

Published: 18 November 2025
on channel: LangChain
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Learn about how to use LangChain's new model fallback middleware to add resilience to your applications. Automatically switch between models and even providers when an API call fails with just a few lines of code.

Our example simulates model failures to demonstrate how the fallback middleware can be used to ensure an agent runs regardless of provider outages or exceeded API quotas.

Middleware docs: https://docs.langchain.com/oss/python...

Code: https://gist.github.com/sydney-runkle...


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