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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.299 ·

A model option list gains a fast mode switch

A model option list now includes a fast mode switch labelled "Fast", with "Enable fast mode" and "Off"

You'll notice Improvements
JSON All of v2.1.299
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ModelsArea: what it touches
ImprovementsKind: in v2.1.299,
ImprovementsSection of the release

Unclear Which screen shows this switch, and what decides whether it appears, is not stated.

What

A list of model options, one that already sets a minimum Claude Code version of 2.1.280 and quick selection, now includes a fast_mode switch. Its label in the picker is "Fast", and its choices are "Enable fast mode" and "Off".

Why

Fast mode may become something you can pick from a model picker.

Read from
Names in the bundlefast_mode
What the documentation says
Documented inapi/api/compliance/organizations
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up fast_mode, on Customize your status line. > "fast_mode": false, statusline see the edit
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhich screen shows this switch, and what decides whether it appears, is not stated.
Anthropic's documentation agreesAnthropic's documentation has since written up fast_mode, on Customize your status line.

See this entry in the whole of v2.1.299 →

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