anthropic.claude-sonnet-4-5-20250929-v1:0 (Amazon Bedrock)

In Amazon Bedrock's words

Model provider: Anthropic; Model name: Claude Sonnet 4.5; Model ID: anthropic.claude-sonnet-4-5-20250929-v1:0; Regions: af-south-1, ap-east-2, ap-northeast-1, ap-northeast-2, ap-northeast-3, ap-south-1, ap-south-2, ap-southeast-1, ap-southeast-2, ap-southeast-3, ap-southeast-4, ap-southeast-5, ap-southeast-6, ap-southeast-7, ca-central-1, ca-west-1, eu-central-1, eu-central-2, eu-north-1, eu-south

Amazon Bedrock, Deprecations page

Facts

API: Amazon Bedrock bedrock.us-east-1.amazonaws.com
Model: anthropic.claude-sonnet-4-5-20250929-v1:0
Released: September 29, 2025 (models.dev)
Kind: Model retirement
Announced: October 8, 2026
Takes effect: April 8, 2027
Calls after that day: Fail
Source: Deprecations page
Last updated: November 4, 2026
Verified: November 6, 2026, against Amazon Bedrock's own pages

Questions

When does anthropic.claude-sonnet-4-5-20250929-v1:0 shut down?

Calls to the model anthropic.claude-sonnet-4-5-20250929-v1:0 on Amazon Bedrock stop working on April 8, 2027.

What happens to calls after April 8, 2027?

They fail from that day.

When was anthropic.claude-sonnet-4-5-20250929-v1:0 released?

anthropic.claude-sonnet-4-5-20250929-v1:0 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.

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Apr 8, 2027 us-gov.anthropic.claude-sonnet-4-5-20250929-v1:0Model retirement Stops workingin 153 days
Apr 8, 2027 us.anthropic.claude-sonnet-4-5-20250929-v1:0Model retirement Stops workingin 153 days

Is your code calling this?

Okapi finds the calls this change hits in your repo and opens the pull request with the fix before April 8, 2027.

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Amazon Bedrock anthropic.claude-sonnet-4-5-20250929-v1:0 model retirement