[BUG] Claude Code Bedrock Model Configuration Error

Hi @cloudeep-innovation,

That inference profile looks like the correct specifier, from https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles-support.html (section "APAC Claude Sonnet 4"). Can you try setting AWS_REGION=ap-northeast-1 too?

If that doesn't work, can you try directly invoking the model via the AWS CLI to confirm model availability and region, something like:

aws bedrock-runtime invoke-model \
    --model-id apac.anthropic.claude-sonnet-4-20250514-v1:0 \
    --body '{"anthropic_version": "bedrock-2023-05-31", "max_tokens": 1000, "messages": [{"role": "user", "content": "Hello, how are you?"}]}' \
    --cli-binary-format raw-in-base64-out \
    response.json

Seeing this same issue. Suggested "aws bedrock-runtime invoke-model" call above from @ant-kurt works with region set to either ap-southeast-2 or the suggested ap-northeast-1 but Claude Code reports
API Error (apac.anthropic.claude-sonnet-4-20250514-v1:0): 400 The provided model identifier is invalid.

Seeing the same issue with Bedrock.

This works, but with claude code with model set to "arn:aws:bedrock:us-west-2:xxxxxxxxx:application-inference-profile/xxxxxxxxx"

I get: API Error (arn:aws:bedrock:us-west-2:xxxxxxxxx:application-inference-profile/xxxxxxxxx ): 400 The provided model identifier is invalid.

This also works in Clint in VS Code, and Pydentic AI framework.

aws bedrock-runtime invoke-model \
  --region us-west-2 \
  --model-id arn:aws:bedrock:us-west-2:xxxxxxxxx:application-inference-profile/xxxxxxxxx \
  --content-type application/json \
  --accept application/json \
  --body fileb://prompt.json \
  response.json
{
    "contentType": "application/json"
}
cat response.json
{"id":"msg_bdrk_0144e5kPDZBLLZfMJSFrdeNg","type":"message","role":"assistant","model":"claude-opus-4-20250514","content":[{"type":"text","text":"Pong! How can I help you today?"}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":8,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":14}}% 

I am seeing the same issue with my region set to eu-central-1. It works with the aws command but claude code is showing an error 400.

Ensure you're setting the AWS_REGION or AWS_DEFAULT_REGION environment variables for the Claude Code process, to a value that matches where the inference profile is available.

# this fails because neither AWS_REGION nor AWS_DEFAULT_REGION were available
# thus Claude Code defaulted to `us-east-1`
CLAUDE_CODE_USE_BEDROCK=1 ANTHROPIC_MODEL=eu.anthropic.claude-sonnet-4-20250514-v1:0 claude -p hi

API Error (eu.anthropic.claude-sonnet-4-20250514-v1:0): 400 The provided model identifier is invalid.

@ant-kurt, thanks. Setting AWS_REGION fixed the issue for me. Region was set in ~/.aws/config which I guess explains why other applications and the aws bedrock-runtime invoke-model test work but looks like Claude Code doesn't use this and needs the explicit AWS_REGION environment variable set.

#!/bin/sh
export CLAUDE_CODE_USE_BEDROCK=1
export AWS_REGION=ap-southeast-2
export ANTHROPIC_MODEL="apac.anthropic.claude-sonnet-4-20250514-v1:0"
claude

@ant-kurt, thanks. Setting AWS_REGION fixed the issue for me. Region was set in ~/.aws/config which I guess explains why other applications and the aws bedrock-runtime invoke-model test work but looks like Claude Code doesn't use this and needs the explicit AWS_REGION environment variable set. `` #!/bin/sh export CLAUDE_CODE_USE_BEDROCK=1 export AWS_REGION=ap-southeast-2 export ANTHROPIC_MODEL="apac.anthropic.claude-sonnet-4-20250514-v1:0" claude ``

Same here. The doc says to use aws configure which sets this config file, so it seemed natural that claude code would use it, just as it uses the credentials file.

Thank you @ant-kurt

Adding the region worked, thanks! @ant-kurt

Closing this one out since it looks like adding env var AWS_REGION fixed this.

We have some upcoming docs updates that should make this requirement more clear, and may also explore reading from AWS config in the future.

If anyone is reading this -- does it mean that (for example) I can only invoke Sonnet 4 from eu-south-2? And I can't even call Opus 4 from EU?

@ant-kurt

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