Azure AI Foundry
claude-sonnet-4-5 model retirement
Stops workingSubscribe to Azure AI FoundryShare
On November 30, 2026, Azure AI Foundry will retire model claude-sonnet-4-5. After this date, calls targeting this model will fail. Ensure your integration is updated before the retirement date to avoid service disruptions.
What to use instead of claude-sonnet-4-5
Move to claude-sonnet-5-5, as recommended by Microsoft.
In Azure AI Foundry's words
Model: claude-sonnet-4-5; Version: 1; Lifecycle: GA; Retirement date: 2026-11-30; Replacement: claude-sonnet-5-5
Facts
- API
- Azure AI Foundry
*.services.ai.azure.com - Model
claude-sonnet-4-5- Released
- September 29, 2025 (models.dev)
- 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.
When was claude-sonnet-4-5 released?
claude-sonnet-4-5 was released on September 29, 2025, according to models.dev.
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 2
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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.