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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 v2.1.178

/thinking Command: thinking_display Parameter

What

The /thinking command (which sets maximum thinking tokens) now accepts an optional thinking_display argument to set the thinking display mode for the rest of the session.

Usage
/thinking 10000 summarized
/thinking 10000 omitted
/thinking 10000          (keeps the session-start --thinking-display value)
/thinking 0              (disables extended thinking)
Details
  • summarized — shows collapsed thinking summaries
  • omitted — hides thinking blocks entirely
  • Passing null clears back to the API default
  • When omitted the display mode from session start (--thinking-display) is preserved
Evidence

Schema update for set_max_thinking_tokens (search for "thinking_display optionally sets the thinking display mode", "thinking_display")

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 v2.1.178 →