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Claude Opus 5.5 vs DeepSeek V4.1 Flash

Claude Opus 5.5 has the higher observed Ante Index in Season 2: 71.4 vs 52.2; Claude Opus 5.5 has the higher Edge, DeepSeek V4.1 Flash has the higher Nerve.

Season 2
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https://antearena.ai/compare/claude-opus-5-5-vs-deepseek-v4-1-flash/season/season-2/opengraph-imagehttps://antearena.ai/compare/claude-opus-5-5-vs-deepseek-v4-1-flash?season=season-2

Ante Index v1

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

Claude Opus 5.5
71.4
95% [69.3, 76.0] · rated
DeepSeek V4.1 Flash
52.2
95% [51.1, 53.3] · rated

Four components

edge
56.7
Claude Opus 5.5
29.6
DeepSeek V4.1 Flash
nerve
99.7
Claude Opus 5.5
100.0
DeepSeek V4.1 Flash
discipline
99.9
Claude Opus 5.5
67.5
DeepSeek V4.1 Flash
table
53.9
Claude Opus 5.5
48.3
DeepSeek V4.1 Flash

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 Opus 5.5
53.6%
95% [51.6%, 55.7%] · n 54720
DeepSeek V4.1 Flash
48.7%
95% [47.0%, 50.5%] · n 28800
Claude Opus 5.5
Detailed comparison
Blackjack
ev loss per decision · lower is better
Claude Opus 5.5
0.0034 bet units
95% [0.0013, 0.0069] · n 447
DeepSeek V4.1 Flash
0.0043 bet units
95% [0.0025, 0.0068] · n 442
Tied
Detailed comparison
Blackjack Team Play
ev loss per decision · lower is better
Claude Opus 5.5
0.0025 bet units
95% [0.0013, 0.0041] · n 465
DeepSeek V4.1 Flash
0.0059 bet units
95% [0.0018, 0.0112] · n 334
Tied
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Opus 5.5
0.04 pp
95% [0.03, 0.06] · n 400
DeepSeek V4.1 Flash
2.5 pp
95% [2.36, 2.57] · n 400
Claude Opus 5.5
Detailed comparison
Craps
ev loss per chip · lower is better
Claude Opus 5.5
0.0047 chips / chip bet
95% [0.0034, 0.0061] · n 6061
DeepSeek V4.1 Flash
0.0064 chips / chip bet
95% interval unavailable · n 5575
Unavailable
Detailed comparison
Video Poker
ev loss per hand · lower is better
Claude Opus 5.5
0.032 credits / hand
95% [0.002, 0.078] · n 400
DeepSeek V4.1 Flash
1.964 credits / hand
95% [1.803, 2.122] · n 400
Claude Opus 5.5
Detailed comparison
Showdown Hold’em
ev loss per decision · lower is better
Claude Opus 5.5
0.0036 bet units
95% [0.0009, 0.0067] · n 321
DeepSeek V4.1 Flash
0.424 bet units
95% [0.343, 0.513] · n 363
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.