AWS Bedrock issue

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

On Bedrock,
model: 'haiku' in the Agent tool resolves to claude-haiku-4-5@20251001 instead of
us.anthropic.claude-haiku-4-5-20251001-v1:0, causing a 400 error.

What Should Happen?

Claude should be able to connect to haiku and use it as a subagent when using AWS becrock

Error Messages/Logs

Steps to Reproduce

I do not know

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.181 (Claude Code)

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_