Bedrock: [1m] context suffix leaks into model ID causing 400 errors

Bug

When using Claude Code with AWS Bedrock, the [1m] context-window suffix is included in the actual API request model ID, causing 400 errors.

Expected model ID sent to Bedrock: global.anthropic.claude-opus-4-7
Actual model ID sent: global.anthropic.claude-opus-4-7[1m]

Reproduction

1. Configure Claude Code with "model": "global.anthropic.claude-opus-4-7" in settings.json (or select via /model)
2. Claude Code appends [1m] to the model ID
3. Bedrock returns: 400 The provided model identifier is invalid

Verification

Direct Bedrock invocation with global.anthropic.claude-opus-4-7 succeeds. The [1m] suffix is an internal Claude Code tag for the 1M context variant and should be stripped before sending to the API.

Environment

• Claude Code v2.1.112
• AWS Bedrock (us-east-1)
• macOS