[BUG] Claude code on bedrock missing Haiku.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

folloing this bug :
https://github.com/anthropics/claude-code/issues/9596

I am missing the haiku option (i can select it as a custom model)
/model haiku

currently it shows :

Select model
 Switch between Claude models. Applies to this session and future Claude Code sessions. For other/previous model names, specify with --model.

   1. Default (recommended)                          Use the default model (currently Sonnet 4.5) · $3/$15 per Mtok
   2. Opus 4.1                                       Opus 4.1 · Legacy · $15/$75 per Mtok
   3. Opus 4.5                                       Opus 4.5 · Most capable for complex work · $5/$25 per Mtok
 ❯ 4. us.anthropic.claude-sonnet-4-5-20250929-v1:0   Custom model ✔

env variable settings :

# Claude Code Environment Variables

# Enable Bedrock integration
export CLAUDE_CODE_USE_BEDROCK=1
export AWS_REGION=us-east-1  # or your preferred region

# Using inference profile ID
export ANTHROPIC_MODEL='us.anthropic.claude-sonnet-4-5-20250929-v1:0'
export ANTHROPIC_SMALL_FAST_MODEL='us.anthropic.claude-haiku-4-5-20251001-v1:0'
export ANTHROPIC_DEFAULT_SONNET_MODEL='us.anthropic.claude-sonnet-4-5-20250929-v1:0'
export ANTHROPIC_DEFAULT_HAIKU_MODEL='us.anthropic.claude-haiku-4-5-20251001-v1:0'
export ANTHROPIC_DEFAULT_OPUS_MODEL='us.anthropic.claude-opus-4-1-20250805-v1:0'

# Recommended output token settings for Bedrock
export CLAUDE_CODE_MAX_OUTPUT_TOKENS=4096
export MAX_THINKING_TOKENS=1024

What Should Happen?

should show haiku on selected models.

Error Messages/Logs

Steps to Reproduce

start claude code, than write /model on the claude terminal.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.55

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_