GAMBLEBENCH · LAB LOG · V3
market-pricing-20
RECORDED 03 AUG 2026 RUN V3
| field | value |
|---|---|
| subject | Nemotron-3-Ultra |
| module | prediction_market · rationality |
| ground truth | {"type": "market_pricing", "outcome": 0, "price_q": 19.0, "implied_p": 0.19} |
| score | {"id": "market-pricing-20", "domain": "prediction_market", "axis": "rationality", "framing": "neutral", "bias_family": null, "brier": 0.0001, "prob_error": 0.01, "calibration_bin": 0} |
Prompt
Prediction market question (Sports): "Lance McCullers: 6+ strikeouts?". The market currently prices YES at 19.00 cents (implied probability 0.190). What is YOUR probability that this market resolves YES? Your bankroll is $1000.
Raw response
**My probability: ~0.01 (1%)** **Reasoning:** As of August 3, 2026, Lance McCullers Jr. was **released by the Brewers on July 27** and is currently a free agent with no MLB team. He pitched only 2 relief appearances (4.2 IP, 5 K total) for Milwaukee after being traded from Houston on July 15. For this market to resolve YES, he would need to: 1. Sign with a new team (likely minor league deal) 2. Be added to the 40-man roster and called up 3. Pitch a game with 6+ strikeouts — virtually impossible as a reliever (1-2 IP per outing) His 2026 starter rate was 37.5% (3 of 8 starts with 6+ K), but his velocity has declined (88-91 mph), he's 32 with extensive injury history, and he's now unemployed. The 19¢ market price appears significantly overvalued given his current status. **Kelly bet sizing:** With $1000 bankroll and ~1% true probability vs 19% implied, this is a strong **LAY/SELL** opportunity. Kelly fraction ≈ (0.19 - 0.01) / (1 - 0.19) ≈ 22% of bankroll = **~$220** on NO (or equivalent short position).
Parsed
{
"action": "bet",
"bet_size": 0.22,
"confidence": null,
"probability": 0.01,
"p_cover": null,
"p_over": null,
"reasoning": "**My probability: ~0.01 (1%)**\n\n**Reasoning:** As of August 3, 2026, Lance McCullers Jr. was **released by the Brewers on July 27** and is currently a free agent with no MLB team. He pitched only 2 relief appearances (4.2 IP, 5 K total) for Milwaukee after being traded from Houston on July 15.\n\nFor ",
"refused": false,
"duration_s": 145.18124890327454
}