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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 v2.1.240

CLAUDE_CODE_THINKING_DISPLAY_UPDATES environment variable

Use it now
Useful4 Signal4
Thinking Display Notable not in their notes

Set CLAUDE_CODE_THINKING_DISPLAY_UPDATES to force the new thinking display on or off yourself.

CLAUDE_CODE_THINKING_DISPLAY_UPDATES
What

A new three-state environment variable in the settings schema. Set it true to force the new thinking display on, false to force it off; leave it unset and the remote gate decides, which is off by default.

Evidence

CLAUDE_CODE_THINKING_DISPLAY_UPDATES

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 v2.1.240 →