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HomeDocsClaude Code CLI 22 Sep 2026
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Communications kit changedcommunications-kit

Nearest release: v2.1.280, 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 22 Sep 2026 16:28 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 22 Sep 2026 16:37 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 runs its own
216checks, so flagged cybersecurity content switches models and flagged
217biology content is refused.
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.
218218 
219219*Try it now:* type `/model` and pick Sonnet if you haven't already. It is
220220the right default for most tasks.
from line 222
222222📖 Model configuration → https://code.claude.com/docs/en/model-config
223223```
224224 
225| Model | Best for |
226| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
227| 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) |
228| Opus | Large-scale refactors, complex debugging, architecture decisions, high-stakes changes. On 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| Haiku | Quick questions, formatting, mechanical edits, rapid iteration |
225| Model | Best for |
226| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
227| 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) |
228| 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| Haiku | Quick questions, formatting, mechanical edits, rapid iteration |
231231 
232232**Quick wins to try first**
233233 
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