Refreshed Chat Design, Microsoft 365 Actions, Claude Sonnet 5.5, DeepSeek V4.1 Flash, Activate Custom Use Cases

New

Refreshed Chat

Any member gets a redesigned chat, with new navigation, a new composer and appearance controls.

Resizable sidebar:
drag the sidebar to the width you want, or collapse it.

Search every conversation:
press
Cmd+K
or
Ctrl+K
to search chats, including older ones and chats inside folders.

Appearance:
choose
System
,
Light
, or
Dark
from the account menu.

Microsoft 365: Agents Can Take Action

Agents connected to Microsoft 365 can now act in Outlook, OneDrive, and SharePoint, not just read from them.

Send email:
chat asks a person to approve each email before it goes out. Emails keep their formatting (bold, lists, links) in Outlook.
Calendar:
cancel meetings, and accept, tentatively accept, or decline invites.
Files:
upload to OneDrive and SharePoint, and share files with people inside the organization.
Sharing outside the organization:
a person approves each external share or "Anyone" link.
SharePoint lists:
add and update list items.
Deletes are confirmed in chat
before anything is removed.
The organization's own Microsoft 365 sharing policies still apply. When Microsoft blocks a share, chat shows Microsoft's reason.

LLMs

Claude Sonnet 5.5

Claude Sonnet 5.5 was added to the model selector for chats, apps, agents, and workflows.

Where Auto uses it:
Performance mode, the default, sends its hardest tasks to Sonnet 5.5, and Turbo uses it for complex work, with the most demanding requests going to Claude Opus 5.5. Lighter coding tasks now go to GPT-6 Luna.
Credits:
1.25x per message, the same as Claude Sonnet 5.
How it compares:
Anthropic's benchmarks put it well ahead of Sonnet 5 on agentic coding and knowledge work, and close to Claude Opus 5.5 (2x).
Good for:
everyday work that needs a strong model: fixing bugs, and polished documents, slides, and spreadsheets.

DeepSeek V4.1 Flash

DeepSeek V4.1 Flash was added to the model selector for chats, apps, agents, and workflows. It's a fast, low-cost model for members who choose their own model, built for long documents, images, and tool use.

Credits:
0.33x per message, the lowest multiplier in Hatz, alongside GLM 5.3 Flash.
How it compares:
DeepSeek's benchmarks put it ahead of Kimi K3 and GLM-5.3, and level with or ahead of Claude Opus 5 and GPT-5.6 Sol on three of four agentic benchmarks.
Good for:
high-volume work where credits matter: summarizing long files, reading screenshots and images, and routine steps in agents and workflows.
With Auto:
Auto doesn't route to it today and already sends lighter work to low-multiplier models like GPT-6 Luna and GLM 5.3 Flash. Choose DeepSeek V4.1 Flash from
All Models
when you want it specifically.

Retired models:

Kimi K2.6, Kimi K2.7-Code, Inkling, and DeepSeek V4 Pro have been retired by their provider. Any agent, workflow, or default that used one now uses a replacement automatically, and DeepSeek V4 Pro moves to DeepSeek V4.1 Flash.

Presenter Tools for Artifacts

When you present an artifact full screen, a small toolbar now offers

Cursor

Laser

, and

Pen

, so you can point at and draw on what you're showing.

Slide decks:
each slide keeps its own drawing. Move to the next slide and it starts clean; go back and your marks are still there.
Clear and undo
work on the current slide only.
Drawings are temporary:
they're never saved into the artifact or its downloads, and they clear when you leave full screen.

Improved

Timestamps and Thinking in Chat

While Hatz works on a reply, a status line now sits right under it in the conversation, showing what it's doing (thinking, using tools, responding) and how long it's been going. When it finishes, the reply shows how long Hatz thought.

MSP Admins

Activate: Add Your Own Use Cases

Activate

, a customer's

Use Cases

tab now has an

Add use cases

button. Pick

Workshop items

you've shared with your tenants, write your own, or have AI suggest one.

Enrich this item:
Hatz researches the use case in about a minute, then fills in its hours, value, and talking points from what it finds.
Into the pitch:
enriched use cases appear in the pitch you generate. You can leave one out of the proposal, though including it is recommended.
Who Has Access:
MSP admins using Activate.

Custom MCP Servers With Public OAuth Apps

Members adding a custom MCP server can connect one whose OAuth app doesn't use a client secret. In
Add Custom MCP Server
, choose
OAuth
, then
I have credentials
, then
Public client (no secret)
.