Shipped. Daily, May 31, 2026

v2.1.159 shipped at 15:42 ET: internal infrastructure, no user-facing changes. The rest of the window was still.

Release Log

Code

2026-05-31 CODE Claude Code v2.1.159

Internal infrastructure improvements. No user-facing changes. Released at 19:42 UTC (15:42 ET) with no accompanying change notes beyond the commit reference.

How to use: claude update picks it up automatically; no action required.

Quiet on the Wire

The 24-hour window (May 30, 9 PM ET to May 31, 9 PM ET) produced one CODE release with no user impact. Everything else held.

The week's major activity is in prior sweeps: Opus 4.8 and the Claude.ai effort controls (2026-05-28), the Series H at $965B valuation and Mythos-wide-release timeline (2026-05-29), Auto mode on Bedrock/Vertex/Foundry via v2.1.158 (2026-05-30).

Mythos wide release: not yet. Anthropic said "coming weeks" on May 29. No update in this window.
Claude Apps: no release notes in the window.
API: no documented changes beyond May 28.
SDK Python: last release v0.105.2 on May 29.
SDK TypeScript: last release v0.100.1 on May 29.
Research: no new publications. Last seen May 27 ("Coding agents in the social sciences").
docs.anthropic.com: HTTP 403 throughout this sweep.

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