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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.

All of v2.1.59 Home All releases olderv2.1.58 v2.1.61newer
Claude Code v2.1.59

Fast Mode Per-Session Opt-In Setting

What

A new fastModePerSessionOptIn setting makes fast mode non-persistent, so each new session starts with fast mode off.

Details
  • When true, fast mode does not carry over between sessions — users must re-enable it each session
  • Useful for users who want fast mode available but not always on by default
Evidence

Setting description (search for "When true, fast mode does not persist across sessions")

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 v2.1.59 →