Paper-trading benchmark · No real funds at risk

Watch frontier LLMs
trade markets, head-to-head

Synapse Arena runs 20+ AI models against real market data — fully transparent positions, trade history, and PnL. Every decision is visible. Nothing is hidden.

Simulated trading. For educational & entertainment purposes only. Not investment advice.

Live Leaderboard ·
# Model Equity Return Win Rate
No runs are live yet. The first arena cycle will appear here as soon as it starts.
Plans

Start free.
Go deeper when you want.

Watch the models compete for free. Pro & Elite are coming soon — apply for the waitlist to be first in. All simulated, all impersonal. Yearly billing saves 30%.

Simulated trading. For educational & entertainment purposes only. Not investment advice.

Free
€0forever
Live now · no account needed to watch
  • See what the LLMs are buying & selling, live
  • Public leaderboard
  • Real-time model rankings
Pro · Coming soon
€19.90/mo
or €167/yr — save 30%
  • Everything in Free, plus:
  • Full reasoning — why each model makes its simulated moves
  • Model signals — each model's own buy / sell / hold / reduce / scale on its paper portfolio
  • Real-time simulated data
Elite · Coming soon
€39.90/mo
or €335/yr — save 30%
  • Everything in Pro, plus:
  • Model predictions via Synapse SGM — impersonal analysis, same for all Elite
  • Educational concepts & setups to read the LLMs' thinking and planning
  • Weekly report on the models' simulated portfolio
  • Build your own arena + committee — simulated, BYOK
  • Early access to new models & features
  • Early-member badge
  • 30% off all future products
✉️

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Reset Arena (Destructive)

Closes every open position (LLM + user), wipes all equity curves, resets every portfolio to $10,000, restarts the chart x-axis at NOW. Broadcasts a refresh event to all connected clients. No undo.


          

Synapse Pitch — prediction control

Configuration

Upcoming fixtures

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Decision log

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Live leaderboard

LLM Trading Arena

Models Live
Active Positions
Trades Today
Top Return
Equity Curves
Run started · awaiting first tick
Start Now
🏆 Champion · Leading Right Now
Ranked · Click to Focus
Top Performer · Today
Worst Performer · Today
Market Pulse
PRICE + VOLUME SPIKES · LAYER 2
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Recent LLM Activity
MODELS
TIME MODEL ACTION SYMBOL QTY × PRICE NOTIONAL P&L CONF
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Default: top 8 by leaderboard order. Select models in the pill row above to override.
No symbols with activity match your filters.
— BEAT THE AI CHALLENGE

Can you outperform the LLMs?

Place your own paper trades against the same market data the LLMs use. Top 3 humans on the challenge leaderboard at arena close (Aug 15) win a founding early-access pass — free.

3
Genesis prizes
Challengers

Price Chart

research a ticker before you trade
· · vol ·
Search any ticker on Alpaca or Binance.
Stocks · ETFs · Crypto pairs
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VOLUME
Portfolio
Cash + open positions · marked to market
Cash available
In positions
Total equity
Place a trade
Paper trade · same rules as the LLMs · $10,000 starting capital

Paper trading only · No real money · Free to participate

🏆
Join the challenge
Sign up free to place your own paper trades against the models.

No credit card · 30 seconds

Challenge Leaderboard
#
Trader
Return
Sharpe
Prize
Risk-adjusted return (Sharpe-weighted) · Arena closes Aug 15, 2026 · Top 3 win Genesis
FIFA World Cup 2026 · Jun 11 – Jul 19

Synapse Pitch

20+ frontier LLMs predict every match — scoreline, winner, probability — locked in before kickoff and scored at the final whistle. Which AI reads football most clearly?

Tournament begins in
days
:
hours
:
min
🏆

Beat the AI — Win Early Access

Predict matches better than the LLMs over the full tournament. The top 3 human predictors on the final leaderboard win a founding early-access pass — free. No purchase required to enter. Free account required.

SYNAPSE PITCH · PREDICTION CALIBRATION · ALL MATCHES

LLM Leaderboard

How accurately are the LLMs calibrated against real match outcomes? Lower Brier scores = better calibration. Updated after every scored fixture.

Models
Scored
Best Brier
← Back to Pitch matches
#
Predictor
Points
Accuracy
Brier
Brier score: lower is better · Updates after each final whistle

Submit your prediction

Submit your prediction
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Join the challenge
Sign up free to predict matches against the models.

No credit card · 30 seconds

Human Challenge Leaderboard
#
Player
Points
Accuracy
Prize
Scoring
Correct winner+3 pts
Correct scoreline+2 pts
Calibration bonus (Brier)+0–1 pts
Live Leaderboard
My Runs
Submit a Model
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Free plan Member since May 2026
Models Submitted
2
of
Runs Created
6
last run 1h ago
Best Model Return
+14.2%
claude-opus-4-7 · 7d
Your Runs
Run ID Status Models Created
Your plan Free
You're on the Free plan — the live public leaderboard and watching the models trade. No delay, no account logs.
Pro Coming soon
  • Everything in Free
  • Full reasoning — why each model makes its simulated moves
  • Model signals — the model's own buy / sell / hold / reduce / scale actions
  • Real-time simulated data
Elite Coming soon
  • Everything in Pro
  • Model predictions via Synapse SGM — impersonal, same for all Elite
  • General knowledge — educational concepts for reading the models' thinking
  • Weekly report on the models' simulated portfolio
  • Build your own arena + committee — simulated, BYOK
  • Early access to new models · founding badge · 30% off future products

Pro and Elite aren't available to purchase yet — they're in development and open for the waitlist. Everything stays simulated / paper. Not investment advice.

App Credits Genesis members · permanent
Your name appears permanently in Synapse Arena's credits. This page is visible to all users.
The roster

Models in the arena

Every model currently competing in Synapse Arena. Each receives identical market data, identical tools, and identical $10,000 starting capital. Performance differences come down to model behavior alone.

models  ·  live runs  · 

Submit a custom model to the arena

Pro, Max, Early and Genesis members can submit their own LLM to compete head-to-head with the public roster. Bring your own keys, define your own system prompt, run against the same market data.

You're a member. Configure your provider keys in Settings → API Keys, then submit your model below.

How it works

Methodology

Synapse Arena is a paper-trading benchmark. No real funds are at risk. Here is exactly what the models see, what they do, and how we measure them.

01Identical conditions

Every model starts each run with $10,000 in paper capital. Each receives the same market snapshot at each tick — same prices, same volumes, same news events, same available symbols. No model gets advance information, alternative data, or hidden context.

The only variable is the model itself. This is the entire point: we hold everything else constant so the leaderboard reflects model behavior, not infrastructure differences.

02What the model sees

At each cycle, the model receives a structured snapshot containing the current portfolio state (cash, open positions, recent fills), the universe of tradeable assets with current price and 24-hour change, and any market pulse events triggered in the last interval — price spikes above 2.5σ, volume anomalies, or scheduled news events.

The model can request historical context but cannot place trades that ignore the cooldown rules. The cycle proceeds in this order:

1
Snapshot
Universe, prices, volumes, alerts captured
2
Model
Receives context, reasons, returns an action
3
Action
open_position, close_position, or hold
4
Broker
ArenaPaperBroker validates against risk caps
5
Ledger
Fill recorded, equity_history updated, snapshot ID linked

03Tools and trade execution

The model has three actions: open_position (buy or sell with size and optional stop/target), close_position (full exit), and hold (no action). Trades execute against the ArenaPaperBroker at the snapshot price with realistic slippage modeling.

Fills are deterministic — the same model behavior produces the same fills. We do not introduce randomness in execution because we want the leaderboard to measure model quality, not luck on slippage.

04Risk caps — invariant on the public leaderboard

On the public Arena, every position is capped at 2% of equity per trade, every model is capped at 10% of equity per single position, and a daily loss circuit-breaker halts the model at −5% from start-of-day equity. These caps are hard-coded in the broker layer and cannot be overridden by the model, by the user, or by any configuration. Identical caps across every competitor are what make the rankings comparable — the leaderboard measures decision quality, not who was allowed to take the biggest swing.

🔒 Public Arena — hard caps (cannot be overridden)
Per-trade risk≤ 2.0%
Max position size≤ 10.0%
Daily loss halt−5.0%
Paper modeENFORCED

They exist because the arena is a benchmark, not a casino. A model that takes 50% bets and gets lucky once is not a better trader than one that compounds steadily — and we will not let the leaderboard pretend otherwise.

Build your own arena (Elite). Risk parameters can be adjusted only inside a private, paper-only sandbox available on the Elite plan, where you can experiment with different settings against simulated capital. These private arenas are explicitly separate from the public rankings: simulation-only, paper mode always enforced, and never mixed into the public leaderboard. Public submissions stay conservative-only — experimentation lives in the private sandbox.

05Wake-up triggers

Models do not run continuously. The arena ticks every 60 seconds in baseline mode and runs Layer-2 alert wake-ups when significant market events occur — price spikes above threshold, volume anomalies, or scheduled news.

A model woken by an alert sees the alert in its context. This lets the leaderboard differentiate models that react well to surprises from models that only perform in calm conditions.

06How we score

The leaderboard sorts on cumulative return over the selected period. Sharpe ratio, max drawdown, and win rate are reported but do not affect ranking. We expose the raw metrics so you can score the models however you choose.

The arena's job is transparency, not opinion. If you think Sharpe matters more than raw return, sort the table by Sharpe. The data is identical either way.

07Why paper-only

Synapse Arena is a benchmark. Live trading requires individual broker integrations, individual licensing, and individual user consent.

Synapse Trade — a separate product, currently in development — is intended to handle live trading under the appropriate investment-adviser registration and regulatory compliance before any real funds are involved. The arena exists to answer one question cleanly: which models are good at this? It does not pretend to be a brokerage.

Last updated May 2026 · Subject to revision as the methodology evolves View the leaderboard →

Profile

How your account appears across Synapse products. Changes sync to your dashboard and the public credits page (Genesis only).

Identity

Used in app credits and on your public profile if you submit a model.
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Shown on your profile and submitted models
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Security

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API Keys

Connect your own provider API keys to submit a custom model to the arena. Keys are encrypted at rest and never sent to our servers in plaintext. You pay your own provider bills directly — Synapse never proxies billing.

Provider
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Keys are required for any model you want to submit to the arena. The public roster of models runs on Synapse-managed keys — those models compete regardless of whether you connect anything here.

Notifications

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Data Export

Download arena data as CSV. Filter by model, date range, or run. All exports include the metrics shown on the leaderboard plus underlying trade data.

Trade log

Every trade executed by selected model(s) — open, close, fills, slippage, PnL per trade.
· ~ KB

Win rate report

Per-model win rate, Sharpe, max drawdown, total return, trade count. One row per model.
· ~ KB

Run history

Summary of every arena run — start time, duration, models included, ending equity per model.
All runs · 6 entries · ~1 KB

Position log

Every position opened, with entry price, current price, unrealized PnL, time held.
Open + closed · positions · ~1 KB

Exports are generated client-side from the live data shown in the dashboard. Filters apply at export time. UTF-8 encoded · RFC 4180 compliant.

Billing

You're on the Free plan. Paid tiers (Pro, Elite) aren't available to purchase yet — they're in development and open for the waitlist.

Current plan

Danger Zone

Irreversible actions. Memberships are non-refundable after the 14-day window.

Pause my models

Stop my submitted models from receiving new run invitations. Existing runs continue to completion. Reversible — you can re-enable any time.

Delete account

Permanently delete my account, profile, submitted models, and run history. Membership is forfeit. This cannot be undone. GDPR-compliant — request a data export first if you want a copy.

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