Product
Claude Haiku 5.5 joins the model picker.
The fastest, lightest Claude is live in Morrison Chat and automations, built for quick, high-volume work: meta descriptions for a whole list, first-pass tagging, short summaries. Haiku 4.5 moves to Older models.
Mads Rued Schleicher, Ulrich Svarrer and Thomas Bogh
3 min read
Claude Haiku 5.5 is live in Morrison Chat and in automations. It is the fastest and lightest Claude, at the $ cost tier, and it replaces Haiku 4.5 in the model picker.
What it is for
The picker describes it plainly: the fastest, cheapest Claude for high-volume and latency-sensitive tasks. In Morrison, that is the work where you need many small answers, quickly.
- Meta descriptions for a whole list. Forty blog posts without one, written in one go. For a whole section, use a workflow.
- First-pass tagging. Sort a segment by topic or funnel stage before you look closer.
- Short summaries. What each page in a section is about, one line each.
- Light automations. A daily check that only needs to read and report.
When a case turns out to be hard, switch the next message to Sonnet 5.5 or Opus 5.5 in the same conversation.
The Claude lineup
Haiku 5.5 for speed, Sonnet 5.5 as the default for new chats, Opus 5.5 for long analysis and Fable 5.1 (now Fable 5.2) for the hardest multi-step work. Haiku 4.5 moves to Older models.
Try it
Pick Claude Haiku 5.5 next to the send button in any chat, or in the automation editor. It is included in the free trial, along with Claude Sonnet 5.5 and Gemini 3.8 Flash. Tell us what you hand it at hello@morrison.app.