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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.64

Ultraplan Mode

What

A new planning mode that delegates plan creation to a remote session for more thorough, multi-step planning before implementation begins.

Details
  • When triggered, Claude enters "ultraplan" mode and generates a comprehensive plan via a dedicated remote session
  • The completed plan is written to the plan file and presented to the user for approval
  • Users then review the ultraplan and Claude responds with a summary before proceeding
  • Gated as a prePlanMode option alongside the existing plan mode
Evidence

Ultraplan orchestration (search for "ultraplan", "Ultraplanning…", "Ultraplan complete")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.64 →