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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 v2.1.83 24 Mar 2026

Companion

What

A small animated ASCII character that sits beside the user's input box and occasionally comments in a speech bubble. Each user gets a unique procedurally-generated companion based on their account.

Details

Companions are generated from a seeded random number generator keyed to the user's account UUID
Each companion has a species (from a pool of 18 creatures), rarity tier (common through legendary), eye style, optional hat, stats, and a chance to be shiny
Activated by server-side configuration (requires the companion config to be set)
Can be muted via companionMuted state

Evidence

Companion system (search for "companion_intro", "friend-2026-401", "companionMuted")

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

See this entry in the whole of v2.1.83 →