Will Anthropic have the best AI model at the end of May 2026? — What PRISM learned

What happened

This market resolved YES on May 31, 2026. The market's pricing turned out to be more accurate than PRISM's assessment.

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Forecast Tape

4 events

May 2, 8:07 AMPUBLISHED
Prism 70% vs market 79% — NONE FAIR
May 4, 2:09 AMRE-ANALYZED
Prism 74% — edge +0.0pp
May 15, 4:29 AMRE-ANALYZED
Forecast NONE → MODERATE at Prism 47%
May 31, 9:09 PMRESOLVED YES
Resolved YES. Market was closer than Prism on this call.

What the market believed

MARKET PRICE · AT FORECAST TIME

78.5%

The market was pricing this event at 78.5% probability when PRISM generated its forecast. PRISM assessed this was too high — the market was overconfident.

What PRISM believed

PRISM PROBABILITY

47.0%

EDGE DETECTED

5.0pp

FORECAST

MODERATE OVERPRICED

Confidence

LOW

Kelly Reference

N/A

PRISM Sizing (¼ Kelly · cap 5%)

N/A

PRISM REASONING

▸Anthropic currently leads the specified leaderboard, but rivals are rapidly closing capability gaps
▸Intense competition over a full year plus volatile arena rankings materially lowers odds of retaining first place

FACTORS FOR

+Anthropic model currently ranked first on the exact leaderboard.
+Strong revenue growth suggests heavy investment and rapid iteration.

FACTORS AGAINST

−OpenAI and Google frontier models are reportedly closing the gap fast.
−Year-long horizon with many potential model releases and reshuffles.

RESOLUTION PATHS MODELED

Anthropic’s current flagship, incrementally improved, remains top-ranked20%

A new Anthropic model launches and takes back or keeps first25%

Evidence 39%

SOURCES (3)

last week

Anthropic Co-Founder Jack Clark: 60% Chance of Recursive AI Self ...mindstudio.ai
Anthropic co-founder Jack Clark publicly put 60% odds on recursive AI self-improvement by end of 2028. Eliezer Yudkowsky's response was blunt.
May 9Open →
2028: Two scenarios for global AI leadership - Anthropicanthropic.com
This acceleration will be driven by the logic of scaling laws, in which model performance improves predictably with increases in computing power and data inputs ...
May 14Open →
Inside Anthropic's $30 Billion Run Rate: How the AI Lab Is Betting Its ...yourstory.com
Anthropic began 2026 with approximately $9 billion in run-rate revenue. By the end of the first quarter, that figure had crossed $30 billion, a more than ...
May 15Open →

PRISM RETRIEVES EVIDENCE FROM A CURATED LIST OF PRIMARY WIRES + OFFICIAL SOURCES

Why the gap existed

Prism's 31.5% edge call was wrong — market was right

CALIBRATION SCORECARD

PRISM ACCURACY

0.302

MARKET ACCURACY

0.034

EDGE

-268.3

Brier edge

The market's probability estimate was more accurate than PRISM's on this call.

How this forecast played out

1.PRISM analyzed Will Anthropic have the best AI model at the end of May 2026?, classifying it as overpriced at 78.5%.

2.Forecast classification: MODERATE OVERPRICED — PRISM estimate 47.0% vs market 78.5%.

3.Kelly reference at forecast time: —% (¼ Kelly, capped at 5%; mathematical reference only — not a position recommendation).

4.Outcome: resolved YES.

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Edge scores, Kelly references, confidence levels, and resolution paths — updated every 2 hours, before the market corrects.

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PRISM: v0.9.125-fast-ledger-floor·Forecasted: May 16, 2026·Resolved: May 31, 2026·polymarket

For informational purposes only. Not financial advice. EdgeCal provides PRISM-generated market analysis and does not execute trades, manage funds, or guarantee returns. Past performance does not indicate future results.