Bedrock models do not work

[draxxris]

You are sending requests to https://bedrock-runtime.us-east-1.amazonaws.com with a model ID of (something like) anthropic.claude-sonnet-5

But you need to specify the region in the model ID, matching the region of the hostname; see: charmbracelet/catwalk#223 -- so something like "us.anthropic.claude-sonnet-5"

> grep error /tmp/vixd.log

12:08:52 [vixd] [llm req=2fd067f6d8a1] SSE stream error after 0 events: POST "https://bedrock-runtime.us-east-1.amazonaws.com/model/anthropic.claude-sonnet-5/invoke-with-response-stream": 400 400 Bad Request {"message":"Invocation of model ID anthropic.claude-sonnet-5 with on-demand throughput isn’t supported. Retry your request with the ID or ARN of an inference profile that contains this model."}

[thebuck25]

@draxxris I found you can override the model names by creating your own provider in providers.json to use the correct naming:

{
  "schema_version": 1,
  "providers": [
    {
      "id": "bedrock",
      "inference": {
        "base_url": "https://bedrock-runtime.${env:AWS_REGION:-us-west-2}.amazonaws.com/",
        "auth_scheme": "bearer",
        "json_set": {
          "anthropic_beta": [
            "context-1m-2025-08-07"
          ]
        }
      },
      "models": [
        {
          "spec": "bedrock/us.anthropic.claude-opus-5",
          "display_name": "Claude Opus 5 (US)",
          "context_window": 1000000
        },
        {
          "spec": "bedrock/us.anthropic.claude-opus-4-8",
          "display_name": "Claude Opus 4.8 (US)",
          "context_window": 200000
        }
      ]
    }
  ],
  "auth_logins": []
}

Note if you do not specify the base_url param it will default to us-east-1 whether or not you have inference there. You must be sure to set the correct region. However there's underlying transport issues that preclude this from actually working. I created a PR to fix those issues so that vix will ignore the empty returns and missing frames from bedrock: #67