December 17, 2025 - Glow Up

A new theme to elevate your notebook experience.

Another big release here at Mito. This time we've made a new theme, make dataframes easier on the eye, and added OpenAI's latest model.

A More Modern UI

We've released our first Mito theme, and it looks great. The theme introduces a more cohesive color palette, cell numbering. We've also revamped the header to make finding Jupyter actions easier.

We've also added a new spreadsheet button to the notebook footer, so you can easily create a Mitosheet.

Lastly, dataframes received a much need face lift.

Agent Quality of Life Changes

Our ever popular Agent mode also saw some welcomed additions in this recent update. To start, we've introduced an audio cue to let you know the agent has completed its task — so feel free to switch tabs.

Code blocks in the chat task pane now have a direct link to the edited cell, so you can click to see the change in the notebook.

You can also tag cells. Try @-ing cell 1.

Finally, we've added a message to let you know when a cell is running. Previously we'd only show a generic "thinking" message.

Other Changes

• GPT-5.2 support.

• Gemini 3 Flash support.

• Support for uploading multiple files via drag-and-drop.

• Removed "format" from list of blacklisted words.

• Re-added mito-ai update notification for desktop users.

• Added instructions to mitigate try/except usage.