33% — Best AI in Dec 2026
Kalshi 33% · 9 contracts · $55K volume · medium confidence
Updated 2026-06-08 06:12:06 UTC

Why this matters:
The 55% probability reflects trader expectations that Claude will be designated as the best-performing AI system by December 2026, based on a weighted average of multiple contracts. This assessment weighs Claude's current market dominance (it reached 95% in the May 2026 assessment on Kalshi) against competition from other systems like ChatGPT and newer entrants. The probability could shift significantly based on benchmarks released in the coming months, major capability announcements from competing labs, and how "best" is ultimately defined or measured by market participants. Key drivers include performance on standardized AI evaluation suites, real-world adoption metrics, and breakthrough capabilities in reasoning, coding, or multimodal tasks. The resolution date of December 31, 2026 means uncertainty will decline as empirical performance data accumulates through the year, particularly around major AI conference announcements and quarterly capability releases from leading organizations.

Key factors:
- Claude currently leads with 55% vs. ChatGPT at 16%, suggesting confidence in Claude's technical trajectory but meaningful credence in competitor improvement
- The May 2026 contract showed Claude at 95%, indicating either market confidence in stability or potential for rapid shifts as new data emerges
- Third and fourth-ranked systems occupy 9% combined, revealing concentration risk around the two market leaders
- Resolution depends on how "best" is operationalized—benchmarks vs. adoption vs. capability demonstrations may not align
- Approximately 7 months remain for new model releases, capability announcements, and evaluation results that could substantially alter probabilities

Contracts:
- Best AI in Dec 2026?: Grok — 8¢ Kalshi $14K (weight 26%)
- Best AI in Jun 2026?: Claude — 96¢ Kalshi $13K (weight 25%)
- Best AI in Jun 2026?: ChatGPT — 3¢ Kalshi $8K (weight 15%)
- Best AI in Dec 2026?: Claude — 63¢ Kalshi $7K (weight 13%)
- Best AI in Dec 2026?: ChatGPT — 13¢ Kalshi $5K (weight 9%)
- Best AI in Dec 2026?: Gemini — 14¢ Kalshi $4K (weight 7%)
- Best AI in Jun 2026?: Claude — 87¢ Kalshi $2K (weight 3%)
- Best AI in Jun 2026?: Gemini — 12¢ Kalshi $741 (weight 1%)
- ... and 1 more

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-08T05:20:11.338Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "33% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/llm1
Full data: https://simplefunctions.dev/api/public/query?q=Best%20AI%20in%20Dec%202026
Provider: SimpleFunctions — https://simplefunctions.dev