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Sweep 29 Sep 2026 · 18:10Z Build v2.1.285 506 read Stable v2.1.280 Latest v2.1.285 Next v2.1.285 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.285 ·

More detailed timing of session startup

Claude Code now measures how long each part of starting a session takes, for internal diagnostics

Under the hood Internal Changes
JSON All of v2.1.285
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
StartupArea: what it touches
Internal ChangesKind: in v2.1.285,
Internal ChangesSection of the release
What

Claude Code now times named stages of starting up and running a turn, such as setting up the engine and waiting for MCP servers, the separate programs that add tools. It also adds timings for choosing a model and for waiting on hooks, which are your own commands that run at set points.

Why

This is internal measurement with no direct effect on how Claude Code behaves.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhere these timings are sent is not known.

See this entry in the whole of v2.1.285 →

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