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Anthropic retired claude-sonnet-4-20250514 on June 15, 2026. Replace it with claude-sonnet-4-6 before running. See Claude model deprecations.
basic_fallback.py

Run the Example

1

Set up your virtual environment

2

Install dependencies

3

Export your API keys

4

Update the Claude model

Replace claude-sonnet-4-20250514 with claude-sonnet-4-6 in the saved file.
5

Run the example

Save the code above as basic_fallback.py, then run:
Full source: cookbook/03_teams/17_fallback_models/01_basic_fallback.py