Claude Code v2.1.73: Model Overrides, Stability Fixes, and Performance Improvements

What's New in Claude Code v2.1.73

Claude Code v2.1.73 introduces practical improvements for developers using AI coding agents, with a focus on stability, configuration flexibility, and cross-platform compatibility.

Key Features and Fixes

• modelOverrides setting: Maps model picker entries to custom provider model IDs, such as Bedrock inference profile ARNs.
• SSL certificate guidance: Added actionable help when OAuth login or connectivity checks fail due to SSL certificate errors, particularly useful for corporate proxies or when using NODE_EXTRA_CA_CERTS.
• Critical stability fixes: Resolved freezes and 100% CPU loops triggered by permission prompts for complex bash commands.
• Deadlock prevention: Fixed a deadlock that could freeze Claude Code when many skill files changed simultaneously, such as during git pull in repositories with large .claude/skills/ directories.
• Bash output preservation: Fixed Bash tool output being lost when running multiple Claude Code sessions in the same project directory.
• Model version consistency: Fixed subagents with model: opus / sonnet / haiku being silently downgraded to older model versions on Bedrock, Vertex, and Microsoft Foundry.
• Process cleanup: Fixed background bash processes spawned by subagents not being cleaned up when the agent exits.
• Command availability: Fixed /loop not being available on Bedrock/Vertex/Foundry and when telemetry was disabled.
• Session handling: Fixed SessionStart hooks firing twice when resuming a session via --resume or --continue.
• JSON-output hooks: Fixed injection of no-op system-reminder messages into the model's context on every turn.
• Voice mode stability: Fixed session corruption when a slow connection overlaps a new recording.
• Linux compatibility: Fixed Linux sandbox failing to start with "ripgrep (rg) not found" on native builds, and Linux native modules not loading on Amazon Linux 2 and other glibc 2.26 systems.
• Remote Control fixes: Fixed "media_type: Field required" API error when receiving images via Remote Control.
• Windows compatibility: Fixed /heapdump failing on Windows with EEXIST error when the Desktop folder already exists.
• VSCode proxy support: Fixed HTTP 400 errors for users behind proxies or on Bedrock/Vertex with Claude 4.5 models.

Improvements and Changes

• Up arrow behavior: Improved to restore interrupted prompts and rewind conversations in one step after interrupting Claude.
• IDE detection: Improved startup speed for IDE detection.
• Clipboard performance: Improved image pasting performance on macOS.
• Command behavior: Improved /effort to work while Claude is responding, matching /model behavior.
• Voice mode reliability: Improved to automatically retry transient connection failures during rapid push-to-talk re-press.
• Remote Control prompts: Improved spawn mode selection with better context.
• Default model update: Changed default Opus model on Bedrock, Vertex, and Microsoft Foundry to Opus 4.6 (was Opus 4.1).
• Command deprecation: Deprecated /output-style command — use /config instead. Output style is now fixed at session start for better prompt caching.

This release addresses multiple edge cases that developers encounter in enterprise environments, particularly around proxy configurations, multi-session workflows, and cross-platform compatibility.