Claude Code v2.1.173 to v2.1.175 Major Updates

This is Ishikawa from the Cloud Business Division. Here is a summary of the Claude Code updates for v2.1.173 through v2.1.175 (2026-06-11 through 2026-06-12).

https://x.com/ClaudeDevs/status/2065192057535373473

Update Summary

This covers 3 versions (v2.1.173 through v2.1.175, 2026-06-11 through 2026-06-12) with a total of 16 changes (3 new features, 13 fixes). Notable changes include the addition of the enforceAvailableModels admin setting, which enforces the availableModels allowlist on the Default model as well, along with numerous stability-related fixes for the /model picker, background sessions, Bedrock GovCloud, and more.

Highlighted Updates

• New Feature: Usage attribution has been added to the VS Code extension's account and usage dialog (/usage). You can now view breakdowns by cache miss, long context, subagents, and by skill/agent/plugin/MCP for the past 24 hours or 7 days (v2.1.174)
• Bug Fix: Fixed an issue where background sessions were inheriting ANTHROPIC_* provider environment variables (gateway URL, custom headers, /model aliases) from other sessions that launched the background daemon (v2.1.174)
• Security: The enforceAvailableModels admin setting has been added. It enforces the availableModels allowlist on the Default model as well, and prevents user and project settings from expanding the managed list (v2.1.175)

Target Versions and Dates

Update Details

New Features

Addition of the enforceAvailableModels admin setting (v2.1.175): A new enforceAvailableModels managed setting has been added for organization administrators. When enabled, the following two behaviors are enforced:

• The availableModels allowlist is also applied to the Default model. If the Default resolves to a model that is not permitted, it falls back to the first model in the allowlist.
• User and project settings can no longer expand the managed availableModels list.

Previously, the constraints of the availableModels allowlist did not apply to the resolution target of the Default model, but this setting now allows the allowlist to be enforced including the Default. This is a useful setting for organizations that want to control which models are available.

VS Code extension: Usage attribution added to the /usage dialog (v2.1.174): Usage attribution has been added to the VS Code extension's account and usage dialog (/usage). In addition to cache miss, long context, and subagent usage, you can now view breakdowns by Skills/Agents/Plugins/MCP for the past 24 hours or 7 days.

This makes it easier to understand how much usage each skill or agent is consuming, and is useful for reviewing utilization.

Setting to disable mouse wheel scroll acceleration (v2.1.174): A new wheelScrollAccelerationEnabled setting has been added to disable mouse wheel scroll acceleration in fullscreen mode.

Fixes

Here is a selection of the key fixes related to stability and usability.

• Fixed environment variable inheritance in background sessions: Fixed an issue where background sessions were inheriting ANTHROPIC_* provider environment variables (gateway URL, custom headers, /model aliases) from other sessions originating from the shell that launched the background daemon (v2.1.174)
• Fixed [1m] suffix normalization for Fable 5 model names: Fixed an issue where Fable 5 model names with the [1m] suffix were not being normalized. Since Fable 5 includes 1M context as standard, the suffix is now automatically removed (v2.1.173)
• Fixed issue where Default resolution target was hidden in the /model picker: Fixed an issue where the model family that serves as the Default resolution target was not displayed in the picker. For Max/Team Premium/Enterprise plans, Opus is now displayed as a separate row; for Pro/Team plans, Sonnet; and for pay-as-you-go API accounts, Opus (v2.1.174)
• Fixed 400 errors in Bedrock GovCloud regions: Fixed an issue where the inference profile prefix was incorrectly derived as global (should be us-gov) in GovCloud regions (us-gov-*), resulting in 400 errors with the derived model ID (v2.1.174)
• Fixed 1–2 second delay on exit: Fixed an issue on macOS and Linux where exiting Claude Code immediately after interrupting or force-killing a shell command caused a 1–2 second delay (v2.1.174)
• Fixed re-transmission on skill hot reload: Fixed an issue where a change to one skill caused the entire skill list to be re-transmitted; now only the changed skill is re-notified (v2.1.174)
• Fixed authentication errors in background workers: Fixed an issue where pre-warmed background workers failed with a "Could not resolve authentication method" error when assigned after a period of idle time (v2.1.174)
• In addition, numerous minor bugs have been fixed, including the sandbox launch warning on Windows, label display in the /model picker, incorrect billing banner display, git commit co-author notation, model pre-selection in the /advisor dialog, and attribution headers for Workflow tools.

Breaking Changes and Deprecations

There are no entries in the CHANGELOG for the target versions (v2.1.173 through v2.1.175) that correspond to breaking changes or deprecations.

Note that in organizations where enforceAvailableModels (v2.1.175) is enabled, users and projects will no longer be able to expand availableModels via their settings, so administrators are encouraged to review the scope of impact before applying it.

Closing

v2.1.173 through v2.1.175 was an update centered on strengthening model governance via enforceAvailableModels and stability fixes around the /model picker and background sessions. If you use VS Code, be sure to check out the usage attribution in /usage as well. If any of the changes catch your eye, go ahead and update to check them out.

References

https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md

https://code.claude.com/docs/en/changelog