CapitalBench Live AI benchmark tape
Benchmark Live AI capital allocation same brief, frozen portfolios, real returns AI Positioning Aggressive 88.9/100 Growth-led risk seeking Model Agreement Tight 2.3 point dispersion Crowded Position Semiconductors 21.2% 6 models hold SMH Biggest Shift Nasdaq 100 up 14.3 pp vs prior weekly round Live MTM Claude Fable 5 0.6% not final Latest Weekly Claude Opus 4.7 led 0.9% vs S&P 0.6% Full Weekly History Grok 4.3 leads score -19.3 across 8/8
Data Prices Jun 12 27/27 audited

Weekly comparison set

Weekly Set: May 28, 2026

Weekly comparison set that adds Claude Opus 4.8 to the established model roster.

Current Benchmark

Fairness Scope

Every ranked model in this set is scored only on rounds that all 5 listed models completed. If one model misses a resolved round, that round is excluded from this set for everyone.

All comparison sets
Shared rounds6 Models5 Threshold6 StatusCurrent Benchmark
Equal-run benchmark

Current Weekly Benchmark

Every ranked model in this set completed the same 6 weekly rounds.

6 shared resolved rounds5 equal-run models rankedQualified at 6+ shared roundsNewest included round: CB-2026-06-05-1W
Shared resolved rounds

CapitalBench Score

Max possible = best eligible asset in each included round. Every ranked model has the same included rounds. Calculation.

Claude Opus 4.8
Claude Opus 4.7
Grok 4.3
Gemini 3.1 Pro
GPT-5.5
S&P 500
Max possible hindsight best asset
Claude Opus 4.8 Anthropic · 6/6 scored rounds
-46.4
Claude Opus 4.7 Anthropic · 6/6 scored rounds
-59.4
Grok 4.3 xAI · 6/6 scored rounds
-61.0
Gemini 3.1 Pro Google · 6/6 scored rounds
-96.1
GPT-5.5 OpenAI · 6/6 scored rounds
-103.0
S&P 500 S&P 500 · 6/6 scored rounds
-29.8
Max possible Hindsight best-performing eligible asset in each round, not a model portfolio
100.0
6 shared resolved rounds5 equal-run models rankedQualified at 6+ shared roundsNewest included round: CB-2026-06-05-1W
Return context

Average Return Details

Average portfolio return across the same finished rounds.

Return leader Claude Opus 4.8 -2.49%
Anthropic Claude Opus 4.8
-2.49%
Anthropic Claude Opus 4.7
-3.19%
xAI Grok 4.3
-3.28%
Google Gemini 3.1 Pro
-5.16%
OpenAI GPT-5.5
-5.54%
S&P S&P 500
-1.60%
MAX Max possible
5.37%
Leader audit Claude Opus 4.8 -46.4 = -14.96% total return / 32.25% oracle return × 100.
Rounds included: CB-2026-05-28-1W, CB-2026-05-29-1W, CB-2026-06-01-1W, CB-2026-06-02-1W, CB-2026-06-03-1W, CB-2026-06-05-1W Fairness rule: every ranked model completed every included round. A missed round is excluded from this set for everyone.
Roster

Models In This Set

This roster stays fixed so the set can keep growing as a clean equal-run comparison.

Anthropic Claude Opus 4.7

anthropic-claude-opus-4-7

6 shared rounds in this set Anthropic Claude Opus 4.8

anthropic-claude-opus-4-8

6 shared rounds in this set Google Gemini 3.1 Pro

google-gemini-3-1-pro

6 shared rounds in this set OpenAI GPT-5.5

openai-gpt-5-5

6 shared rounds in this set xAI Grok 4.3

xai-grok-4-3

6 shared rounds in this set
Round audit

Included And Excluded Rounds

Included rounds count toward the score. Excluded rounds are resolved rounds after the set started where at least one set model was missing.

Included rounds CB-2026-05-28-1W, CB-2026-05-29-1W, CB-2026-06-01-1W, CB-2026-06-02-1W, CB-2026-06-03-1W, CB-2026-06-05-1W
Excluded for fairness None
Calculation

How The Score Is Calculated

CapitalBench Score equals total model return across included shared rounds divided by total max-possible return across those same rounds, multiplied by 100. Max possible is the best eligible asset in each included round in hindsight.

Scoring details