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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.287 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.287 ·

Turn timing breakdown split into finer phases

The timing breakdown before a turn's first model request splits resume and input handling into finer phases and records why a turn resumed

Group of 3 Under the hood Internal Changes
JSON All of v2.1.287
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.287,
Internal ChangesSection of the release

What

Claude Code can report how long each step takes before it sends a turn to the model. A turn is one round of you asking and Claude answering. That breakdown is now finer:

  • Resume phases: the single turn_start_resume phase is replaced by resume_other, resume_store_confirm, resume_staged_files_wait and resume_connector_wait. Older versions still report the single turn_start_resume key.
  • New phases: turn_start_tool_run and system_prompt_rebuild are added.
  • Input phases: processing your input is now marked in four steps, input_hooks, input_attachments, input_images and input_command.
  • Resume kind: a new turn_start_resume_kind field says why the turn resumed, one of orphaned_permission, turn_handoff, deferred_tool_use or none.
  • Pasted content: text you paste is now passed into attachment building as pastedContents.
  • Compression: the record kept when gzip compression falls back now includes gzipBlocks. A new ccs_container_monitor entry also appears in a list.

The data is produced in remote sessions (CLAUDE_CODE_REMOTE) and on hosts that set CLAUDE_CODE_EMIT_STARTUP_TIMING.

Why

If you read these timings, delays before the first model request can now be traced to a narrower step. Anything that reads the turn_start_resume key should expect the new names from this version.

See this entry in the whole of v2.1.287 →

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