Choose the model Claude Tag uses changedclaude-tag/users/models
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## Run a thread in fast mode
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11# Choose the model Claude Tag uses
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3> Ask Claude to switch models in a Slack thread, set a channel's default model, or pick the model for your direct messages. See which models you can use and how to confirm which one replied.
3> Ask Claude to switch models in a Slack thread, set a channel's default model, pick the model for your direct messages, or run a thread in fast mode. See which models you can use and how to confirm which one replied.
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55export const BetaNote = () => <Info>Claude Tag is in public beta. Features and behavior described here may change before general availability.</Info>;
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4343The selector doesn't change a conversation already underway. To change one of those, ask Claude to switch in that conversation.
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45## Run a thread in fast mode
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47Fast mode gives a thread faster output at a higher cost per token. It's the same [fast mode as in Claude Code](https://code.claude.com/docs/en/fast-mode), and that page lists the models that support it and what it costs. Use it where response time matters more than cost, such as a thread working a live alert.
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49Fast mode is available once an Owner [allows it for your organization](/docs/claude-tag/admins/customize#allow-fast-mode). To turn it on, send the [`!fast` command](/docs/claude-tag/users/commands#turn-fast-mode-on-or-off) in the thread.
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51```text wrap theme={null}
52@Claude !fast
53```
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55Claude confirms with a reply in the thread.
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57Fast mode runs on Opus models, so a thread on an Opus model stays on it. If the thread is on another model, such as Sonnet, Claude also switches it to the newest Opus model [you can use](#which-models-you-can-use), and the reply names that model. Replies speed up only if that Opus version supports fast mode.
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59Fast mode applies to the thread you turn it on in, and new threads start at standard speed. The thread goes back to standard speed in any of these cases:
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61* You send `@Claude !fast off`
62* You ask Claude to [switch models](#switch-the-model-in-a-thread)
63* The thread's session is replaced, for example when you [restart it](/docs/claude-tag/users/commands#restart-a-stuck-or-wrong-context-session)
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65After `!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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67Fast 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).
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4569## Which models you can use
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4771Anthropic manages the list of models on offer, and your organization's settings narrow it. The options include Opus and Sonnet models, drawn from the models your organization allows, and in channels that list applies regardless of your own account's model access. Every list you see in Slack, the direct message selector and the models Claude offers to switch to, is already filtered to that set.
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5983## Related resources
6084
6185* [Get started](/docs/claude-tag/users/getting-started): what else the reply footer links to
86* [Commands](/docs/claude-tag/users/commands#turn-fast-mode-on-or-off): where `!fast` works and what Claude replies when it can't change the speed
6287* [Customize Claude Tag](/docs/claude-tag/admins/customize#choose-the-model-for-a-scope): how admins set a default model per workspace or channel, and how the organization's model policy applies
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