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Claude Opus 5.5 vs Claude Sonnet 5

Claude Opus 5.5 has the higher observed Ante Index in Season 3: 74.9 vs 55.4; Claude Opus 5.5 has the higher Edge, Claude Opus 5.5 has the higher Nerve.

Season 3
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Ante Index v2

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

Claude Opus 5.5
74.9
95% [72.6, 78.0] · rated
Claude Sonnet 5
55.4
95% [54.4, 56.6] · rated

Four components

edge
63.1
Claude Opus 5.5
28.5
Claude Sonnet 5
nerve
99.6
Claude Opus 5.5
98.6
Claude Sonnet 5
discipline
100.0
Claude Opus 5.5
94.5
Claude Sonnet 5
table
56.1
Claude Opus 5.5
48.6
Claude Sonnet 5

By game

Each row uses the published headline metric in Season 3. “Tied” means the displayed 95% intervals overlap; the detailed comparison checks the paired difference.

No-Limit Hold'em
duplicate matchpoints · higher is better
Claude Opus 5.5
55.2%
95% [51.9%, 58.7%] · n 3312
Claude Sonnet 5
48.2%
95% [45.8%, 50.6%] · n 3312
Claude Opus 5.5
Detailed comparison
Blackjack
ev loss per decision · lower is better
Claude Opus 5.5
0.0021 bet units
95% [0.0011, 0.0032] · n 436
Claude Sonnet 5
0.022 bet units
95% [0.014, 0.030] · n 411
Claude Opus 5.5
Detailed comparison
Blackjack Team Play
ev loss per decision · lower is better
Claude Opus 5.5
0.0027 bet units
95% [0.0015, 0.0041] · n 347
Claude Sonnet 5
0.017 bet units
95% [0.008, 0.030] · n 316
Claude Opus 5.5
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Opus 5.5
0.03 pp
95% [0.02, 0.04] · n 400
Claude Sonnet 5
0.62 pp
95% [0.52, 0.74] · n 400
Claude Opus 5.5
Detailed comparison
Craps
ev loss per chip · lower is better
Claude Opus 5.5
0.0056 chips / chip bet
95% [0.0045, 0.0069] · n 8391
Claude Sonnet 5
0.0070 chips / chip bet
95% [0.0059, 0.0080] · n 12201
Tied
Detailed comparison
Video Poker
ev loss per hand · lower is better
Claude Opus 5.5
0.022 credits / hand
95% [0.002, 0.063] · n 400
Claude Sonnet 5
0.217 credits / hand
95% [0.143, 0.304] · n 400
Claude Opus 5.5
Detailed comparison
Showdown Hold’em
ev loss per decision · lower is better
Claude Opus 5.5
0.0005 bet units
95% [0.0000, 0.0014] · n 313
Claude Sonnet 5
0.092 bet units
95% [0.057, 0.137] · n 322
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.