Azure AI Foundry
claude-sonnet-4-5 model retirement
Stops working
On November 30, 2026, the model claude-sonnet-4-5 will be retired. Calls targeting model claude-sonnet-4-5 will fail after that day.
What to use instead of claude-sonnet-4-5
Move to claude-sonnet-5-5, which is recommended by Microsoft.
Facts
- API
- Azure AI Foundry
*.services.ai.azure.com - Model
claude-sonnet-4-5- Kind
- Model retirement
- Takes effect
- November 30, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Azure AI Foundry's own pages
Questions
When does claude-sonnet-4-5 shut down?
Calls to the model claude-sonnet-4-5 on Azure AI Foundry stop working on November 30, 2026.
What happens to calls after November 30, 2026?
They fail from that day.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
claude-sonnet-4-5 on other APIs 1
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Is your code calling this?
Okapi finds the calls this change hits in your repo and opens the pull request with the fix before November 30, 2026.