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Sweep 27 Oct 2026 · 19:04Z Build v2.1.312 531 read Stable v2.1.308 Latest v2.1.312 Next v2.1.312 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.312 ·

Cloud worker connections can ask for compression

Claude Code's worker connection can now offer compression when it connects, and a fault in how the connection was stored is fixed

Under the hood Internal Changes
JSON All of v2.1.312
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Cloud SessionsArea: what it touches
Internal ChangesKind: in v2.1.312,
Internal ChangesSection of the release
What

When Claude Code runs as a worker, for example in a cloud session, it opens a lasting two-way connection called a WebSocket. When opening it, Claude Code now decides whether to offer compression, which shrinks the data sent. If it does, it says so in the connection address. If that decision fails, Claude Code logs an error and connects without offering compression.

A fault is also fixed: the opened connection used to be stored in the wrong place, and it is now stored where it belongs.

Why

Compression can cut the amount of data a cloud worker session sends and receives.

See this entry in the whole of v2.1.312 →

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