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 v2.1.68 Home All releases olderv2.1.67 v2.1.69newer
Claude Code v2.1.68

Removed silent medium-effort auto-migration

Feature flag
tengu_grey_step2 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 v2.1.68: no gate table built for this version

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 v2.1.68. It isn't a statement about your account. What a flag value here can and cannot tell you

The automatic migration that silently set Opus 4.6 effort to "medium" has been removed.

Details
  • Previously, on startup, the app would set opus46EffortMediumMigrationTimestamp and briefly flash "Opus 4.6 effort updated to medium"
  • This silent migration has been completely removed — effort is no longer changed behind the scenes
  • Default effort for Opus 4.6 is now determined by feature flags (tengu_quartz_falcon, tengu_grey_step2) rather than a one-time migration
Evidence

Removed migration function (search for "opus46EffortMediumMigrationTimestamp" — present in v2.1.67, absent in v2.1.68)

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

See this entry in the whole of v2.1.68 →