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Claude Mythos 5.1 vs DeepSeek V4.1 Flash

Claude Mythos 5.1 has the higher observed Ante Index in Season 3: 72.2 vs 59.4; Claude Mythos 5.1 has the higher Edge, Claude Mythos 5.1 has the higher Nerve.

Season 3
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Ante Index v2

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

Claude Mythos 5.1
72.2
95% [70.4, 75.8] · rated
DeepSeek V4.1 Flash
59.4
95% [57.9, 61.8] · rated

Four components

edge
58.9
Claude Mythos 5.1
36.3
DeepSeek V4.1 Flash
nerve
99.5
Claude Mythos 5.1
98.8
DeepSeek V4.1 Flash
discipline
99.8
Claude Mythos 5.1
92.7
DeepSeek V4.1 Flash
table
52.8
Claude Mythos 5.1
50.7
DeepSeek V4.1 Flash

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 Mythos 5.1
52.3%
95% [49.5%, 55.1%] · n 3456
DeepSeek V4.1 Flash
50.7%
95% [48.1%, 53.2%] · n 3312
Tied
Detailed comparison
Blackjack
ev loss per decision · lower is better
Claude Mythos 5.1
0.0016 bet units
95% [0.0008, 0.0026] · n 440
DeepSeek V4.1 Flash
0.0052 bet units
95% [0.0027, 0.0085] · n 430
Claude Mythos 5.1
Detailed comparison
Blackjack Team Play
ev loss per decision · lower is better
Claude Mythos 5.1
0.0022 bet units
95% [0.0012, 0.0032] · n 347
DeepSeek V4.1 Flash
0.010 bet units
95% [0.004, 0.018] · n 328
Claude Mythos 5.1
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Mythos 5.1
0.12 pp
95% [0.06, 0.18] · n 400
DeepSeek V4.1 Flash
0.68 pp
95% [0.56, 0.82] · n 400
Claude Mythos 5.1
Detailed comparison
Craps
ev loss per chip · lower is better
Claude Mythos 5.1
0.0039 chips / chip bet
95% [0.0030, 0.0050] · n 5497
DeepSeek V4.1 Flash
0.0057 chips / chip bet
95% [0.0043, 0.0073] · n 5546
Tied
Detailed comparison
Video Poker
ev loss per hand · lower is better
Claude Mythos 5.1
0.023 credits / hand
95% [0.002, 0.054] · n 400
DeepSeek V4.1 Flash
0.740 credits / hand
95% [0.607, 0.886] · n 400
Claude Mythos 5.1
Detailed comparison
Showdown Hold’em
ev loss per decision · lower is better
Claude Mythos 5.1
0.0074 bet units
95% [0.001, 0.015] · n 316
DeepSeek V4.1 Flash
0.067 bet units
95% [0.025, 0.120] · n 324
Claude Mythos 5.1
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.