You can now choose Claude Sonnet 5 when working in Threads. This latest model from Anthropic joins the model catalogue, giving you another high-quality option for drafting copy, refining ideas, and working through complex briefs with your brand context applied.
There are two versions to pick from:
Claude Sonnet 5 — the standard model, suited to everyday writing and creative tasks.
Claude Sonnet 5 (Thinking) — an extended reasoning mode that works through problems more thoroughly before responding. Reach for this when you're tackling multi-step tasks or want the model to reason carefully.
How to use it
Open a Thread, or start a new one with the New Thread button.
Open the model dropdown at the top of the message composer.
Select Claude Sonnet 5 or Claude Sonnet 5 (Thinking).
Write your message as usual. Your Brand Hub context is applied automatically, whichever model you choose.
Tips
Use the standard Claude Sonnet 5 for quick drafts and conversational back-and-forth.
Switch to Claude Sonnet 5 (Thinking) when a task benefits from deeper reasoning, such as structuring a campaign, working through detailed instructions, or reviewing complex material. Responses may take a little longer as the model reasons through the problem.
Because Euryka is model-agnostic, you can compare Claude Sonnet 5 against other models on the same brief and keep the result that works best.