01
$1,000 cash
Best Overall
The strongest combination of utility, polish, scope, and execution.
Selected by the Constants team
Tools for Claude & ChatGPT Hackathon · Remote · September 18–20
Tools4AI Hackathon
Presented by Constants
Build a tool for Claude or ChatGPT, get people using it, win $1k.
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A new platform is opening up.
1.2B+ people use AI assistants across ChatGPT and Claude. Starting this year, both platforms can run tools that let assistants take action and complete real work inside the chat. These tools can include their own UI, opening a world of new possibilities.
We are at the start of a platform shift, like websites in the 1990s or mobile apps at the beginning of the 2010s. The most important ideas have not been built yet.
This hackathon is an invitation to explore the frontier. Turn an idea into a working tool with Constants, then deploy it to ChatGPT and Claude so people can use it where they already work. Change the way people use AI by building an app that inspires, educates, entertains, empowers, connects, or accelerates.
Prizes
$3,000
$1,000 cash per category. Winners also receive one year of Constants Pro. Runners-up receive Constants Pro.
02
$1,000 cash
Most Popular
The tool that earns the most community love after it goes live.
Measured by likes and reposts on X
03
$1,000 cash
Most Creative
The most original idea, interaction, or use of an agent-native tool.
Selected by the Constants team
Schedule
September 17
11:59 p.m. PT
Website registration closes
September 18
Day one
Hackathon begins · build opens
September 19
Day two
Publish, share, and gather real usage
September 20
Final day
Submission deadline
Entry requirements
New, public, and working.
Entries must be built and published with the Constants platform during the hackathon, publicly runnable, work end to end, and follow the publishing guidelines.
Screen recording
Show the published tool being used successfully inside Claude or ChatGPT.
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X post
Publish your demo on X so the community can discover, try, and support your work.
Also include the public Constants tool link and a short tool description. All four items are required. Submit them in Discord or email hello@constants.io.
Judging criteria
01
Ease of use
Can someone understand the tool's name, inputs, and interface without explanation?
02
Creativity
Does the tool solve a problem in a novel or unexpected way?
03
Impact
Does the tool aim to solve a real problem for a real audience?
04
Execution
Does the tool work reliably from input to final result?
FAQs
When and where is the hackathon?
The hackathon runs remotely from September 18 through September 20, 2026. The Constants Discord is the event hub for announcements, community support, and the live usage leaderboard.
Where do I register?
Register directly on the Constants website by September 17 at 11:59 p.m. PT. You will need to sign in with the Constants account you plan to use during the hackathon. Joining Discord is separate and strongly recommended. Review the Official Rules before registering.
What can I submit?
You may submit one tool. It must be built and published with the Constants platform during the hackathon, be publicly runnable, work end to end, and follow the publishing guidelines.
Do I have to build with Constants?
Yes. All entries must be built and published with the Constants platform, then demonstrated working inside Claude or ChatGPT.
What does a complete submission include?
Your submission must include the public Constants tool link, a short tool description, a screen recording showing it working inside Claude or ChatGPT, and a link to a public X post featuring the tool. Submit all four items in Discord or email them to hello@constants.io.
How are winners selected?
The Constants team selects Best Overall and Most Creative using the published judging criteria. Most Popular is measured by likes and reposts on X.
Registration closes September 17
Your idea gets a weekend.
Register here with your Constants account, then join Discord for announcements, support, and the live leaderboard.