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Claude Mythos 5.1 vs GPT-5.6 Terra

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, GPT-5.6 Terra has the higher Table.

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
GPT-5.6 Terra
59.4
95% [58.2, 60.9] · rated

Four components

edge
58.9
Claude Mythos 5.1
33.0
GPT-5.6 Terra
nerve
99.5
Claude Mythos 5.1
98.7
GPT-5.6 Terra
discipline
99.8
Claude Mythos 5.1
99.4
GPT-5.6 Terra
table
52.8
Claude Mythos 5.1
55.2
GPT-5.6 Terra

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
GPT-5.6 Terra
56.3%
95% [53.8%, 58.8%] · n 3456
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
GPT-5.6 Terra
0.019 bet units
95% [0.011, 0.028] · n 436
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
GPT-5.6 Terra
0.0047 bet units
95% [0.0025, 0.0076] · n 352
Tied
Detailed comparison
Roulette
target regret · lower is better · Exhibition
Claude Mythos 5.1
0.12 pp
95% [0.06, 0.18] · n 400
GPT-5.6 Terra
0.32 pp
95% [0.24, 0.41] · 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
GPT-5.6 Terra
0.0082 chips / chip bet
95% [0.0071, 0.0095] · n 11432
Claude Mythos 5.1
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
GPT-5.6 Terra
0.175 credits / hand
95% [0.116, 0.254] · 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
GPT-5.6 Terra
0.077 bet units
95% [0.049, 0.113] · n 312
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.