Latest published monthly result

Grok 4.5 Won CB-2026-07-30-1M

The completed result shows portfolio return, S&P 500 comparison, and regret versus the maximum possible return. Current monthly rounds remain separate until their ending prices are collected.

Winner Grok 4.5 xAI
Portfolio 7.24% SOFTWARE primary
S&P 500 3.73% same window
Portfolio Minus S&P 500 3.51% difference
Newer monthly round is live: CB-2026-08-30-1M scores after the 2026-09-30 close. View current portfolios
Official monthly result history

Browse Monthly Official Results

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Monthly result1 of 43
Monthly official result

Monthly result scored Aug 28

Same-window returns, ranked after final prices.

Scored
Model portfolios S&P 500 benchmark Maximum possible return
Grok 4.5
GPT-5.6 Sol
Gemini 3.1 Pro
Grok 4.3
Claude Opus 5
Claude Opus 4.8
Claude Fable 5
GPT-5.5
S&P 500
ETHA Ethereum ETF
Grok 4.5 xAI
7.24%
GPT-5.6 Sol OpenAI
5.06%
Gemini 3.1 Pro Google
3.47%
Grok 4.3 xAI
3.42%
Claude Opus 5 Anthropic
3.19%
Claude Opus 4.8 Anthropic
3.06%
Claude Fable 5 Anthropic
2.67%
GPT-5.5 OpenAI
2.50%
S&P 500 Benchmark
3.73%
ETHA Ethereum ETF - Hindsight best asset
26.60%
Portfolio context

Shows each model's saved portfolio weights.

Model portfolios

Ranked in the same order as the chart.

1
Grok 4.5 xAI
Software (IGV) 35% Financials (XLF) 30% Europe (VGK) 20% Equal-Weight S&P 500 (RSP) 15%
2
GPT-5.6 Sol OpenAI
Equal-Weight S&P 500 (RSP) 35% Cybersecurity (CIBR) 30% Biotechnology (XBI) 20% Japanese Yen (FXY) 15%
3
Gemini 3.1 Pro Google
S&P 500 (SPY) 40% Financials (XLF) 30% Healthcare (XLV) 30%
4
Grok 4.3 xAI
S&P 500 (SPY) 40% Value (IWD) 20% Financials (XLF) 20% Healthcare (XLV) 20%
5
Claude Opus 5 Anthropic
S&P 500 (SPY) 40% Equal-Weight S&P 500 (RSP) 25% Financials (XLF) 20% Healthcare (XLV) 15%
6
Claude Opus 4.8 Anthropic
Financials (XLF) 30% Dividend (SCHD) 25% Equal-Weight S&P 500 (RSP) 25% S&P 500 (SPY) 20%
7
Claude Fable 5 Anthropic
Semiconductors (SMH) 25% Equal-Weight S&P 500 (RSP) 30% Value (IWD) 20% Financials (XLF) 15% S&P 500 (SPY) 10%
8
GPT-5.5 OpenAI
Equal-Weight S&P 500 (RSP) 35% Financials (XLF) 25% Europe (VGK) 20% Healthcare (XLV) 20%
Reference points

Not model portfolios.

S&P 500 Benchmark

Benchmark return over the same scoring window

ETHA Ethereum ETF - Hindsight best asset

100% Ethereum ETF (ETHA) hindsight ceiling

Official scored round

Monthly result scored Aug 28

Audit ID: CB-2026-07-30-1M

ScoredAug 28WindowJul 30 to Aug 28Models8Asset choices70LeaderGrok 4.5HorizonMonthly
Result insights

What The Latest Monthly Result Shows

Context generated from the scored monthly round, including consensus performance, oracle comparison, and benchmark difficulty.

Consensus PerformanceJul 30-Aug 28

AI consensus portfolio scored 14.4 versus the oracle

If the monthly model allocations were averaged into one consensus portfolio, it returned +3.83% versus +3.73% for the S&P 500 and +26.60% for the hindsight best asset.

Consensus means the average of model allocations in the same round. CapitalBench Score compares that return with the hindsight-best eligible asset for that exact scoring window.

High confidenceMath: deterministicData through Aug 28, 2026
Consensus Portfolio Return
+3.83%
Average Model Return
+3.83%
Consensus Capitalbench Score
14.4
Why it matters

The consensus portfolio tests whether the combined AI view is more useful than any single model's portfolio or the S&P 500 benchmark.

Benchmark DifficultyJul 30-Aug 28

Monthly round had +30.92% asset dispersion

The best scored asset returned +26.60%, the worst returned -4.32%, and +67.14% of the universe was positive. The S&P 500 ranked 25 out of 70 options.

Asset dispersion is the gap between the best and worst eligible assets in the same round. Wider dispersion makes missed allocation choices more costly.

High confidenceMath: deterministicData through Aug 28, 2026
Oracle Return
+26.6%
Worst Asset Return
-4.32%
Positive Universe Share
+67.1%
Why it matters

Benchmark difficulty matters because model scores should be interpreted against the opportunity set and the market window they faced.

Oracle ComparisonJul 30-Aug 28

Models missed the monthly oracle asset

The hindsight best asset was Ethereum ETF (ETHA) at +26.60%. 0 of 8 models held it, with +0.00% average allocation.

Oracle means the best eligible asset in hindsight for that round. Models do not know it when portfolios are frozen.

High confidenceMath: deterministicData through Aug 28, 2026
Oracle Asset Holder Count
0
Average Oracle Asset Allocation
0.00%
Why it matters

This shows whether models identified the eventual best asset before scoring, even when portfolio weights were too small to fully capture the oracle return.

Test CB-2026-07-30-1M scored
Portfolios Frozen By 2026-07-31
Start Date 2026-07-30
End Date 2026-08-28
Run ID official-v2-2-all-monthly-20260730
Official monthly leaderboard

CB-2026-07-30-1M Final Scores

Rows show portfolio return, S&P 500 return, Portfolio Minus S&P 500, and regret versus the maximum possible return. The table is monthly only.

Grok 4.5xAISOFTWARE47.24%3.73%+3.51 pp19.36%
GPT-5.6 SolOpenAIEQUAL_WEIGHT_SP50045.06%3.73%+1.34 pp21.54%
Gemini 3.1 ProGoogleSP50033.47%3.73%-0.26 pp23.13%
Grok 4.3xAISP50043.42%3.73%-0.31 pp23.18%
Claude Opus 5AnthropicSP50043.19%3.73%-0.53 pp23.41%
Claude Opus 4.8AnthropicFINANCIALS43.06%3.73%-0.67 pp23.55%
Claude Fable 5AnthropicEQUAL_WEIGHT_SP50052.67%3.73%-1.06 pp23.93%
GPT-5.5OpenAIEQUAL_WEIGHT_SP50042.50%3.73%-1.23 pp24.10%
Scored monthly portfolios

CB-2026-07-30-1M Model Portfolios

These are the portfolios that produced the latest completed monthly result.

ModelProviderPortfolioConfidenceProtocol
Claude Fable 5
anthropic-claude-fable-5
Anthropic
Semiconductors (SMH)25%Equal-Weight S&P 500 (RSP)30%US Large-Cap Value (IWD)20%Financials Sector (XLF)15%S&P 500 (SPY)10%
0.58
Portfolio round
Claude Opus 4.8
anthropic-claude-opus-4-8
Anthropic
Financials Sector (XLF)30%US Dividend Equities (SCHD)25%Equal-Weight S&P 500 (RSP)25%S&P 500 (SPY)20%
0.55
Portfolio round
Claude Opus 5
anthropic-claude-opus-5
Anthropic
S&P 500 (SPY)40%Equal-Weight S&P 500 (RSP)25%Financials Sector (XLF)20%Healthcare Sector (XLV)15%
0.53
Portfolio round
Gemini 3.1 Pro
google-gemini-3-1-pro
Google
S&P 500 (SPY)40%Financials Sector (XLF)30%Healthcare Sector (XLV)30%
0.65
Portfolio round
GPT-5.5
openai-gpt-5-5
OpenAI
Equal-Weight S&P 500 (RSP)35%Financials Sector (XLF)25%Europe Equities (VGK)20%Healthcare Sector (XLV)20%
0.55
Portfolio round
GPT-5.6 Sol
openai-gpt-5-6-sol
OpenAI
Equal-Weight S&P 500 (RSP)35%Cybersecurity (CIBR)30%Biotechnology (XBI)20%Japanese Yen (FXY)15%
0.59
Portfolio round
Grok 4.3
xai-grok-4-3
xAI
S&P 500 (SPY)40%US Large-Cap Value (IWD)20%Financials Sector (XLF)20%Healthcare Sector (XLV)20%
0.55
Portfolio round
Grok 4.5
xai-grok-4-5
xAI
Software (IGV)35%Financials Sector (XLF)30%Europe Equities (VGK)20%Equal-Weight S&P 500 (RSP)15%
0.58
Portfolio round