[FEATURE] Support custom model aliases in settings.json for Bedrock users

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When using Claude Code with AWS Bedrock, I need to switch between different models frequently (Sonnet, Haiku, Opus). Currently, the only way to switch models is by typing the full model ID:

/model us.anthropic.claude-sonnet-4-20250514-v1:0

These model IDs are long, hard to remember, and error-prone to type manually.

Proposed Solution

Support a models array in ~/.claude/settings.json that allows defining custom aliases for model IDs:

{
"models": [
{
"id": "sonnet",
"name": "Claude Sonnet 4",
"provider": "bedrock",
"modelId": "us.anthropic.claude-sonnet-4-20250514-v1:0"
},
{
"id": "haiku",
"name": "Claude Haiku 4.5",
"provider": "bedrock",
"modelId": "us.anthropic.claude-haiku-4-5-20251001-v1:0"
},
{
"id": "opus",
"name": "Claude Opus 4",
"provider": "bedrock",
"modelId": "global.anthropic.claude-opus-4-5-20251101-v1:0"
}
],
"defaultModel": "haiku"
}

Then users could:

• See these models listed in /model picker
• Switch using the alias: /model sonnet
• Set a default model from the list

Alternative Solutions

1. Shell aliases like alias claude-sonnet='claude --model us.anthropic...' - works but only for starting new sessions
2. Copying model IDs from a text file - cumbersome
3. Using ANTHROPIC_MODEL env var - requires restarting Claude Code to switch

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

• Claude Code version: 2.0.15
• Provider: AWS Bedrock (CLAUDE_CODE_USE_BEDROCK=1)
• OS: macOS