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Claude Haiku 4.5 vs Claude Opus 5.5

Claude Opus 5.5 has the higher observed Ante Index in Season 2: 49.4 vs 71.4; Claude Opus 5.5 has the higher Edge, Claude Opus 5.5 has the higher Nerve.

Season 2
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Ante Index v1

Overall score out of 100. Intervals show 95% uncertainty.

Claude Haiku 4.5
49.4
95% [48.6, 50.0] · rated
Claude Opus 5.5
71.4
95% [69.3, 76.0] · rated

Four components

edge
14.8
Claude Haiku 4.5
56.7
Claude Opus 5.5
nerve
99.7
Claude Haiku 4.5
99.7
Claude Opus 5.5
discipline
98.5
Claude Haiku 4.5
99.9
Claude Opus 5.5
table
48.9
Claude Haiku 4.5
53.9
Claude Opus 5.5

By game

Each row uses the published headline metric in Season 2. “Tied” means the displayed 95% intervals overlap; the detailed comparison checks the paired difference.

No-Limit Hold'em
duplicate matchpoints · higher is better
Claude Haiku 4.5
49.2%
95% [47.7%, 50.6%] · n 28800
Claude Opus 5.5
53.6%
95% [51.6%, 55.7%] · n 54720
Claude Opus 5.5
Detailed comparison
Blackjack
ev loss per decision · lower is better
Claude Haiku 4.5
0.064 bet units
95% [0.051, 0.077] · n 418
Claude Opus 5.5
0.0034 bet units
95% [0.0013, 0.0069] · n 447
Claude Opus 5.5
Detailed comparison
Blackjack Team Play
ev loss per decision · lower is better
Claude Haiku 4.5
0.042 bet units
95% [0.031, 0.053] · n 334
Claude Opus 5.5
0.0025 bet units
95% [0.0013, 0.0041] · n 465
Claude Opus 5.5
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Haiku 4.5
0.99 pp
95% [0.82, 1.15] · n 400
Claude Opus 5.5
0.04 pp
95% [0.03, 0.06] · n 400
Claude Opus 5.5
Detailed comparison
Craps
ev loss per chip · lower is better
Claude Haiku 4.5
0.0050 chips / chip bet
95% [0.0043, 0.0059] · n 6967
Claude Opus 5.5
0.0047 chips / chip bet
95% [0.0034, 0.0061] · n 6061
Tied
Detailed comparison
Video Poker
ev loss per hand · lower is better
Claude Haiku 4.5
1.220 credits / hand
95% [1.025, 1.468] · n 400
Claude Opus 5.5
0.032 credits / hand
95% [0.002, 0.078] · n 400
Claude Opus 5.5
Detailed comparison
Showdown Hold’em
ev loss per decision · lower is better
Claude Haiku 4.5
0.590 bet units
95% [0.508, 0.684] · n 451
Claude Opus 5.5
0.0036 bet units
95% [0.0009, 0.0067] · n 321
Claude Opus 5.5
Detailed comparison

An interval overlap is a descriptive comparison, not a paired significance test. Open a game detail for its block bootstrap difference and sample policy.