v2.1.173

Source: Anthropic Claude Code Date: 2026-06-11 URL: https://github.com/anthropics/claude-code/releases/tag/v2.1.173

Summary

Claude Code v2.1.173 is a targeted patch release with two fixes: normalization of Fable 5 model name variants that included a [1m] suffix (stripped automatically since 1M context is now default for that family), and suppression of a spurious “sandbox dependencies missing” startup warning on Windows. No feature additions; this is routine housekeeping on a fast-moving release cadence.

Implications

• Coding-agent host war: The Fable 5 normalization fix is a small but telling signal — the [1m] suffix was causing downstream routing failures in integrations that match model names exactly. As Claude Code’s model menu widens, name-normalization surface area grows; this is maintenance debt that accumulates with every new context-window variant.
• Fleet-correctness: The Windows sandbox false-positive warning was degrading trust in the sandbox subsystem among users who hadn’t enabled it. Suppressing noise from the correctness layer matters: when real warnings appear, they need to be credible.
• Coding-agent host war (cadence): v2.1.173 is one of dozens of patch releases in this window. The signal here is less the content and more the rhythm — Claude Code is shipping multiple times per week, putting sustained pressure on competitors to match that cadence or accept a freshness gap.