[BUG] AWS Bedrock, Calling us-east-2 region instead of the specified region

You're setting AWS_REGION=us-east-1 ? Can you try it without a profile, ie set AWS_PROFILE= and use AWS_ACCESS_KEY_ID etc?

Yes, I actually tried that as well. Even when setting the environment variables as shown below, I get exactly the same error message and logs.

export AWS_PROFILE=''
export AWS_ACCESS_KEY_ID='MY_AWS_ACCESS_KEY'
export AWS_SECRET_ACCESS_KEY='MY_AWS_SECRET_ACCESS_KEY'
export AWS_REGION=us-east-1
export AWS_DEFAULT_REGION=us-east-1

export CLAUDE_CODE_USE_BEDROCK=1
export ANTHROPIC_MODEL='us.anthropic.claude-3-7-sonnet-20250219-v1:0'
export ANTHROPIC_SMALL_FAST_MODEL='us.anthropic.claude-3-5-haiku-20241022-v1:0'
export DISABLE_PROMPT_CACHING=1

Here's a summary of what I think might be causing the issue:

The problem may be that an inference profile is needed, and AWS Bedrock only provides cross-region inference.

I suspect that Bedrock doesn't account for scenarios like mine where regions are restricted for security reasons.

Therefore, I imagine that regardless of the Credentials or AWS_REGION specified, when us.anthropic.claude-3-7-sonnet-20250219-v1:0 is requested, AWS internally routes to use the model in us-east-2.

!Image

If this assumption is correct, then the issue isn't with Claude Code itself...

Yes, that sounds right. What happens if you use the us-east-1 arn for the model instead of us...

I tried the following:
First, I got the Sonnet and Haiku ARNs:

aws bedrock list-foundation-models --region us-east-1 --by-provider anthropic --query "modelSummaries[?contains(modelArn, '3-7-sonnet') || contains(modelArn, '3-5-haiku')].modelArn" 

Then, after setting these ARNs as environment variables, I ran claude and tried "hello", but received:

> hello

  ⎿  API Error: Truncated event message received.

I got

    "arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-3-7-sonnet-20250219-v1:0",
    "arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-3-5-haiku-20241022-v1:0"

Confusingly, need to escape the inference profile like https://github.com/anthropics/claude-code/issues/297#issuecomment-2715511132

    "arn:aws:bedrock:us-east-1::foundation-model%2Fanthropic.claude-3-7-sonnet-20250219-v1:0",
    "arn:aws:bedrock:us-east-1::foundation-model%2Fanthropic.claude-3-5-haiku-20241022-v1:0"

As you suggested, I tried escaping the slashes, and it seems the ARN was recognized correctly. However, I received an error indicating it wasn't an inference profile.

Invocation of model ID anthropic.claude-3-7-sonnet-20250219-v1:0 with on-demand throughput isn’t supported

I think we can state that one requirement for using AWS Bedrock with Claude Code is:

• Access to Bedrock in each region is necessary because inference profiles require cross-region capability

This may be outside the scope of Claude Code, so it doesn't need to be included in the documentation,
but it might be helpful to add as a troubleshooting tip.

Also, in my current environment, enabling us-east-2 and us-west-2 requires security review.
I would have liked to test with these regions enabled and share the results, but that's not possible for me.

This issue can be closed as it's related to AWS specifications.
Thank you for your help!

Thanks for looking into it! We'll get the docs updated 🙏

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