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Claude Opus 5.5 vs GPT-6 Astra

GPT-6 Astra has the higher observed Ante Index in Season 3: 74.9 vs 87.5; GPT-6 Astra has the higher Edge, Claude Opus 5.5 has the higher Table.

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
GPT-6 Astra
87.5
95% [85.6, 88.9] · rated

Four components

edge
63.1
Claude Opus 5.5
89.3
GPT-6 Astra
nerve
99.6
Claude Opus 5.5
100.0
GPT-6 Astra
discipline
100.0
Claude Opus 5.5
100.0
GPT-6 Astra
table
56.1
Claude Opus 5.5
52.1
GPT-6 Astra

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
GPT-6 Astra
52.5%
95% [50.3%, 54.9%] · n 3312
Tied
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
GPT-6 Astra
0.0017 bet units
95% [0.0009, 0.0027] · n 438
Tied
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
GPT-6 Astra
0.0021 bet units
95% [0.0012, 0.0031] · n 342
Tied
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Opus 5.5
0.03 pp
95% [0.02, 0.04] · n 400
GPT-6 Astra
0.01 pp
95% [0, 0.01] · n 400
GPT-6 Astra
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
GPT-6 Astra
Unavailable
95% interval unavailable · n 0
Unavailable
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
GPT-6 Astra
0.0006 credits / hand
95% [0.0000, 0.0013] · n 400
GPT-6 Astra
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
GPT-6 Astra
0.0003 bet units
95% [0.0000, 0.0008] · n 314
Tied
Detailed comparison

These models sat at the same Hold’em table in Season 3. See their shared-table 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.