October 21–22, 2026

Dates confirmed · submissions due Oct 22, 7:00 PM CT

The fourth edition — now the Open Scientific Intelligence (OSI) Hackathon — runs Wednesday–Thursday, October 21–22, 2026, hybrid and worldwide. Teams start at their preferred local time on October 21, and every team worldwide submits by the same deadline: October 22, 7:00 PM CT (5:00 PM PT). Updates are announced in Slack first.

Day 1 · Wed, Oct 21 · your local time

Kick-off, teaming, hacking begins

Teams can start at their preferred local time on October 21. The kick-off video is provided virtually. Some sites may run morning programming; virtual hub builders go straight to teaming and building.

Day 2 · Thu, Oct 22 · due 7:00 PM CT

Build day and final submissions

Focused development with mentors available on Slack and in Zoom. Project submissions are due by October 22, 7:00 PM CT (5:00 PM PT; 00:00 UTC Oct 23), worldwide.

After the event · TBA

Winners announced & virtual showcase

Judging wraps up, awards are announced, and featured projects are invited to present. Date to be announced.

What to Expect

Day 1: Getting Started

Day 2: Development & Presentation

After the Event

Time Zones

Teams start on October 21 at whatever local time suits them. The one fixed time is the submission deadline: October 22, 7:00 PM Central Time (CDT, UTC−5), which is 5:00 PM Pacific. In other time zones that is:

Local organizers will share any site-specific schedules.


Previous Edition: September 11-12, 2025

Kept here for reference.

9:00 AM (CT), Sept 11

Hackathon Kick-off

Kick-off (virtual video - link soon) and opening teaming event

10:00 AM (CT), Sept 11

Hacking Begins

Mentorship sessions available.

17:00 PM (CT), Sept 12

Final Submissions

Project submission deadline.

time ASAP, ~Sept 15

Post-Event Showcase

Winners Announced, Featured Projects Invited to Virtual Showcase

2025 Deadlines

Formerly the LLM Hackathon for Applications in Materials and Chemistry