Source Intelligence

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.

All of v2.1.166 Home All releases olderv2.1.165 v2.1.167newer

Auto-mode model config supports per-model overrides

Feature flag
tengu_auto_mode_config Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.166: not a boolean we can read

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.166. It isn't a statement about your account. What a flag value here can and cannot tell you

The auto-mode model selection logic now supports a modelByMainModel map in the tengu_auto_mode_config feature flag. This lets the server configure different auto-mode models depending on which primary model is currently active (including the [1m] extended-context variant), giving Anthropic more fine-grained control over model routing without a client update.

Evidence

Updated auto-mode resolver (search for "modelByMainModel")

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

See this entry in the whole of v2.1.166 →