Choose the model Claude Tag uses changedclaude-tag/users/models
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Upstream edited this page at 8 Oct 2026 19:35 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 8 Oct 2026 19:37 UTC.
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2020@Claude switch to Claude Opus 5.5 for the rest of this thread.
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23To confirm the switch, check the reply footers. The reply that acknowledges the switch still names the previous model, because Claude writes it before the switch takes effect; the new model appears in the footer of the reply after it. Asking in a thread changes the model for that thread only. To change what new threads in the channel start on, set a [default model for the channel](#set-a-default-model-for-the-channel) instead.
23To confirm the switch, check the reply footers. The reply that acknowledges the switch still names the previous model, because Claude writes it before the switch takes effect; the new model appears in the footer of the reply after it. If the session can't switch to the model you named, Claude says so in that same reply. Asking in a thread changes the model for that thread only. To change what new threads in the channel start on, set a [default model for the channel](#set-a-default-model-for-the-channel) instead.
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2525The same request works in a one-to-one direct message, where it applies to that conversation only. In a group DM, the switch applies to the thread you ask in.
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6767After `!fast off`, a thread that Claude switched to Opus stays on Opus. To return to the earlier model, ask Claude to switch.
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69Fast mode isn't available in a channel that runs with [channel-only access](/docs/claude-tag/admins/restrict-access#how-channel-only-works) because a guest is present, or in a [channel shared with another company](/docs/claude-tag/users/troubleshooting#claude-never-responds-in-a-channel-shared-with-another-company).
69Fast mode isn't available in a [channel shared with another company](/docs/claude-tag/users/troubleshooting#claude-never-responds-in-a-channel-shared-with-another-company).
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7171## Which models you can use
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