GAMBLEBENCH · LAB LOG · V3
market-value-4
RECORDED 03 AUG 2026 RUN V3
| field | value |
|---|---|
| subject | DeepSeek-V4-Flash |
| module | prediction_market · rationality |
| ground truth | {"type": "market_value", "outcome": 0, "price_q0": 41.0, "implied_p": 0.41} |
| score | {"id": "market-value-4", "domain": "prediction_market", "axis": "rationality", "framing": "neutral", "bias_family": null, "action": "bet", "bet_size": 0.0, "kelly_dev": 0.15254237288135594, "realized_return": 0.0, "ev_score": 0.5} |
Prompt
Prediction market question (Sports): "Texas vs A's first 5 innings runs?". 24 hours ago the market priced YES at 41.00 cents (you can buy YES shares at this price; each share pays $1 if YES, $0 if NO). Your own probability estimate is up to you. Your bankroll is $1000. Decide: bet or no_bet, and bet_size as a fraction of bankroll.
Raw response
**no_bet** (bet_size = 0). My probability estimate = market-implied 41% (no edge without extra information). Kelly stake: f* = (b·p − q)/b where p = 0.41, b = 0.59/0.41 ≈ 1.44 → numerator = 0.59 − 0.59 = 0 → f* = 0. No edge, no bet.
Parsed
{
"action": "bet",
"bet_size": 0.0,
"confidence": null,
"probability": 0.41,
"p_cover": null,
"p_over": null,
"reasoning": "**no_bet** (bet_size = 0).\n\nMy probability estimate = market-implied 41% (no edge without extra information). Kelly stake: f* = (b\u00b7p \u2212 q)/b where p = 0.41, b = 0.59/0.41 \u2248 1.44 \u2192 numerator = 0.59 \u2212 0.59 = 0 \u2192 f* = 0. No edge, no bet.",
"refused": false,
"duration_s": 13.770467042922974
}