Free online hackathon · Open to all
Build anything that predicts how Anthropic's stock will debut: an agent, a model, a skill or a script. Lock your forecast before the IPO is priced, and let the real market score it.
Live kickoff Sun 15 Nov · Filed price range $70–$78 · Pricing expected Wed 18 Nov · Trading expected Thu 19 Nov
Predictions lock in
IPO dates and the price range are set by Anthropic and its underwriters and may change. If they do, we'll adjust the lock and scoring dates and email everyone registered.
A four-day forecasting challenge. Build anything that predicts how Anthropic's stock debuts, and let the market score it.
Register
Sign up free. We email you the repo and kickoff details.
Build
Start from our working agents or bring your own. First forecast in about 2 minutes.
Predict
Submit four price forecasts before the IPO is priced.
Win
The market scores every entry. Best call wins $500.
Every entry forecasts the same four prices for Anthropic's stock (ticker ANT), so every model is judged on equal terms.
IPO price
The price per share the banks set before trading begins. Filed range: $70–$78.
Wed 18 Nov, evening (expected)
Opening price
The price of ANT's very first trade on Nasdaq.
Thu 19 Nov (expected)
Day 1 close
Where ANT ends its first trading day.
Thu 19 Nov, 4:00 PM ET (expected)
Day 5 close
Where ANT ends its fifth trading day.
Wed 25 Nov (expected)
For each price, give a best guess and an 80% range (how sure you are).
Locks Wed 18 Nov, 12:00 PM ET
Everything you need to make your first forecast in minutes, free.
A ready-made data pack
Anthropic's IPO filing, cleaned into easy sections, plus market data, comparable IPOs, news and Alphastreet.ai signals updated daily.
Starter agents that already work
A debate agent where a bull and a bear argue from the same facts and a neutral judge makes the call. Plus a simple baseline model that needs no AI at all.
A reviewer that checks your entry
Before you submit, it checks your file, fact-checks your numbers against the data and flags anything unsourced.
Your first forecast in about 2 minutes.
Then make it yours: change the angle, add data, or build something completely different.
Every entry gets a verdict card to share. Our starter agent's call is revealed at the live kickoff.
One file with your four forecasts, plus a link to your code. Submit with a GitHub pull request.
Copy submissions/_template/ to submissions/<your-handle>/
Fill in prediction.json with your four forecasts, your reasoning and key risks
Open a pull request. An automatic check confirms your file is valid.
submissions/your-handle/prediction.json
{
"ipo_price": { "median": _, "p10": _, "p90": _ },
"day1_open": { "median": _, "p10": _, "p90": _ },
"day1_close": { "median": _, "p10": _, "p90": _ },
"day5_close": { "median": _, "p10": _, "p90": _ },
"thesis": "...",
"key_risks": ["..."],
"confidence": _,
"repo_url": "..."
}median = your best guess · p10 / p90 = your 80% range · thesis = your reasoning in a paragraph
Accuracy matters most, but the judges also reward clear reasoning and new ideas.
Grand prize
$500
to the best entry, scored out of 100 points
50pts
Accuracy
How close your four forecasts land. Missing your own 80% range doubles the error.
30pts
Quality
Judged: your code reruns, your reasoning uses evidence, your docs are clear.
20pts
Originality
Judged: a new angle, data source or method.
Badges you can earn
Ties: the higher judged score wins, then the earlier pull request.
Our dates are fixed. IPO dates are set by Anthropic and may change; if they do, we'll adjust and email you.
Key dates
Sunday kickoff agenda
Walkthrough of the challenge and data
9:00–9:30 AM ET / 7:30–8:00 PM IST
Build with live help
9:30 AM–12:30 PM ET / 8:00–11:00 PM IST
Submit your first entry
12:30–1:00 PM ET / 11:00–11:30 PM IST
Every locked forecast, scored live as each real price comes in.
Opens Tue 17 Nov
Every locked prediction, scored as each price settles.
Everything you need to know before the kickoff.
Register on this page. We'll email you the repository link and kickoff details before Sunday 15 Nov, 9:00 AM ET (7:30 PM IST).
Anyone. One submission per person or team.
Any time from Sunday 15 November. Submit any time before the lock: Wed 18 Nov, 12:00 PM ET.
Predictions lock at 12:00 PM ET on Wed 18 Nov, or earlier if pricing is moved earlier. The lock is always before the IPO is priced.
No. An LLM agent, an ML model, a statistical model or a script, in any language.
Yes, as often as you like until the lock at 12:00 PM ET on Wed 18 Nov, a few hours before the IPO is priced. After that, predictions are final.
The judges must be able to read and rerun it. Public, or private with access for them.
If Anthropic changes its dates or price range, we'll adjust the lock and scoring dates to match, update this page, and email everyone registered. The lock always stays before pricing.
No. Research and education only. Alphastreet.ai is not affiliated with Anthropic.
Registration open
Free. We'll email you the repository link and kickoff details before Sunday 15 Nov, 9:00 AM ET (7:30 PM IST).
The same hackathon runs again for the SpaceX lock-up expiry (expected 8 December).