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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 28 Sep 2026
One change · claude-code

Communications kit changedcommunications-kit

Nearest release: v2.1.284, published under an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 28 Sep 2026 17:53 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 28 Sep 2026 18:07 UTC.

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212212*Fable* is the most
213213capable model for your hardest, longest-running tasks; it is not the
214214default, so select it with `/model fable`, and note that cybersecurity and
215biology content falls back to Opus automatically. Opus 5.5 and Opus 5 run
216their own checks too: flagged content switches to an earlier Opus, except
217that flagged biology content on Opus 5 is refused.
215biology content falls back to Opus automatically. Opus 5.5, Sonnet 5.5, and
216Opus 5 run their own checks too: flagged content switches to an earlier model
217in the same family, except that flagged biology content on Opus 5 or Sonnet
2185.5 is refused.
218219 
219220*Try it now:* type `/model` and pick Sonnet if you haven't already. It is
220221the right default for most tasks.
from line 227
226227| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
227228| Fable | The hardest, longest-running tasks. Opt-in only: select it with `/model fable`. Cybersecurity or biology content triggers [automatic model fallback to Opus](/docs/en/model-config#automatic-model-fallback) |
228229| Opus | Large-scale refactors, complex debugging, architecture decisions, high-stakes changes. On Opus 5.5 and Opus 5, cybersecurity or biology content triggers [automatic model fallback or a refusal](/docs/en/model-config#automatic-model-fallback) |
229| Sonnet | Everyday feature work, bug fixes, tests, documentation, code review. Recommended default. |
230| Sonnet | Everyday feature work, bug fixes, tests, documentation, code review. Recommended default. On Sonnet 5.5, cybersecurity or biology content triggers [automatic model fallback or a refusal](/docs/en/model-config#automatic-model-fallback) |
230231| Haiku | Quick questions, formatting, mechanical edits, rapid iteration |
231232 
232233**Quick wins to try first**
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