Product
Claude Sonnet 5.5 is the new default.
Every new chat now starts on Claude Sonnet 5.5, a faster Sonnet for everyday analysis, writing and research. Sonnet 5 moves to Older models, and you can still switch models per message.
Mads Rued Schleicher, Ulrich Svarrer and Thomas Bogh
3 min read
Claude Sonnet 5.5 is the new default in Morrison. Every new chat starts on it. It takes over from Sonnet 5, which has been the default since July.
Why a Sonnet
Most of the work in Morrison is everyday work. A question about last month’s clicks. A brief for a page you are about to refresh. A sharper intro. A quick look at one segment. The default should be quick and good at all of it.
The picker describes Sonnet 5.5 as a faster Sonnet for everyday analysis and writing. It sits at the same $$ cost tier as Sonnet 5.
What changes for you
- New chats start on Sonnet 5.5. You do not need to change anything.
- You can still switch per message. Click the model name next to the send button and pick any other model for the next turn.
- Automations choose their own model. Set it in the automation editor, the same way as before.
- Sonnet 5 moves to Older models. It is still in the picker, at the bottom.
When to switch
For long, multi-step analysis, reach for Claude Opus 5.5 or Claude Fable 5.2. For a quick pass over many pages, a $ model does the job. Sonnet 5.5 covers everything in between.
Try it
Start a new chat and ask the question you ask every week. Sonnet 5.5 is included in the free trial, along with Claude Haiku 5.5 and Gemini 3.8 Flash. Then tell us how it compares at hello@morrison.app.