AWS Bedrock Sonnet 1m context models is not working

[parthiban-subramani]

I couldn’t find the AWS Bedrock Sonnet 1M-context model in models.dev, so I created a custom config.

{
  "$schema": "https://opencode.ai/config.json",
  "model": "us.anthropic.claude-sonnet-4-5-20250929-v1:0[1m]",
  "provider": {
    "amazon-bedrock": {
      "models": {
        "us.anthropic.claude-sonnet-4-5-20250929-v1:0[1m]": {
          "name": "Claude Sonnet 4.5[1m] (AWS Bedrock)",
          "options": {
            "thinking": {
              "type": "enabled",
              "budgetTokens": 16000
            }
          }
        }
      }
    }
  }
}

However, when I initiate the chat, I get an error. Any idea how to resolve this?

When I change the model to "anthropic.claude-sonnet-4-5-20250929-v1:0[1m]", I get this error.