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Slashy’s agent chat lets you choose the model behind a conversation. Haiku and Sonnet are ready to use. Opus and Fable run on your own Anthropic API key. Automatic drafts, autocomplete, and inline editing run on models Slashy manages, so there is nothing to configure for them.

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The model picker

The picker sits at the bottom left of the message box in the agent chat (Cmd+/). Click the model name to switch. You can change models between messages, but not while the agent is replying. Models that need a key show a key icon until you add one. If you connect a ChatGPT subscription, Codex models appear in the same list. See Connect your Codex subscription.
Agent chat model picker open, listing Haiku, Sonnet, Opus, and Fable with key icons on the models that need an Anthropic key

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Unlock Opus and Fable with your own key

Opus and Fable are billed by Anthropic to the account that owns the key. Slashy does not charge for that usage. Don’t have a key yet? See Get an Anthropic API key.
1

Open the model picker

Click the model name at the bottom of the agent chat message box.
2

Choose Opus or Fable

Slashy asks for your Anthropic key to unlock the model you picked.
3

Paste your key and save

Paste the key, which starts with sk-ant-, and click Save. The model is selected as soon as the key is stored.
Prompt asking for an Anthropic API key after choosing a model that needs one

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Manage your key

Open Settings, then Integrations, and find the Claude API key card. The AI filter narrows the page to it. Its status reads “Unlocks Claude Opus and Fable”. Click Connect to add a key or Disconnect to remove it. Without a key, Opus and Fable are unavailable and the picker returns to a model that doesn’t need one. You can also press Cmd+K and search for Manage Anthropic API key.
Settings, Integrations filtered to AI, showing the Claude API key card
Your key is stored on your account only and is not shared with teammates. Each person brings their own.
A common pattern: leave the picker on a model that needs no key for everyday questions, and switch to Opus or Fable for the hardest requests.

Get an Anthropic API key

Create a key in the Anthropic Console.

Connect your Codex subscription

Use your own ChatGPT/Codex plan in agent chat.

Sidebar Agent & Command Palette

Chat with the agent and run commands.

AI privacy

How your data is handled.