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8181* **Size up larger tasks**: give it work you would normally break into pieces. It holds long sessions without losing the thread.
8282
8383<Note>
84 Fable 5.1 requires Claude Code v2.1.257 or later. If a request for it from an older version fails, see [Claude Code does not support this model](/docs/en/errors#claude-code-does-not-support-this-model). Fable 5 requires v2.1.170 or later. Run `claude update` to upgrade. For availability under zero data retention, see [Model availability under ZDR](/docs/en/zero-data-retention#model-availability-under-zdr).
84 Fable 5.1 requires Claude Code v2.1.257 or later. If a request for it from an older version fails, see [Claude Code does not support this model](/docs/en/errors#claude-code-does-not-support-this-model). Run `claude update` to upgrade. For availability under zero data retention, see [Model availability under ZDR](/docs/en/zero-data-retention#model-availability-under-zdr).
8585</Note>
8686
8787On the Anthropic API, the `/model` picker lists a Fable model only after the server reports it available for your organization. When you type `/model fable` or a Fable model ID, Claude Code checks availability with the server directly, so a typed selection can succeed even when the picker doesn't list the entry.