TOTAL VOLUME:
$97.2b
24H VOL:
$195,930,743
24H TRANSACTIONS:
950,106,883
OPEN INTEREST:
$2,066,493,046
825,151
Markets across
14,840
events
MATCHED EVENTS:
886
PLATFORM COVERAGE:
5
Polymarket:
45%
VS.
Kalshi:
55%
Claude Mythos: Text Arena Debut? Odds & Prediction Markets
Will Anthropic release Mythos before Jan 1, 2027?
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Intro
This market tracks whether Anthropic will release a model called Mythos and the timing of that release. Across Polymarket and Kalshi, the aggregated consensus shows an 18.0% probability that Anthropic releases Mythos before January 1, 2027, with a 17.0% probability for a release before December 1, 2026. Resolution will be determined by Anthropic's official announcement of a Mythos model release. Watch for any official communications from Anthropic regarding new model launches, as the November 1, 2026 date marks the resolution cutoff for the primary market condition.
PredictionHero - Resolution Divergence Alerts (RDA)
Divergence Detected
Issue: Kalshi markets resolve on model release timing alone, while Polymarket markets require both leaderboard debut and performance threshold achievement. A YES on Kalshi does not guarantee YES on Polymarket.Hero tip: Kalshi YES (model released) and Polymarket NO (not on leaderboard or below score) can occur simultaneously. Treat these as separate bets: Kalshi is a release-timing play; Polymarket is a leaderboard-adoption and performance play. If you are long Kalshi, consider whether Anthropic will prioritize Arena.AI leaderboard submission and whether Mythos will be competitive enough to hit the score thresholds.Critical divergence points:
- Kalshi: Release-only trigger. Eight markets, each with a different deadline (Jun 15, 2026 through Jan 1, 2027). Resolves YES if Anthropic officially releases any model officially named 'Mythos' before the specified date. No leaderboard, score, or public availability requirement. Key quote: 'If Anthropic releases A model called Mythos before [date], then the market resolves to Yes.'
- Polymarket: Leaderboard-debut and performance-threshold trigger. Four markets, each with a different score threshold (1480+, 1490+, 1500+, 1510+). Resolves YES only if (a) a model with 'Mythos' in its official name appears on arena.ai/leaderboard/text, (b) the score is measured at 12:00 PM ET on the calendar day following first appearance, and (c) the score meets or exceeds the threshold. If model is released but never added to leaderboard, or added but scores below threshold, resolves NO. Key quote: 'This market will resolve to Yes if the first Claude Mythos model added to the Arena.AI Leaderboard has at least the specified score at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to No.'
Polymarket
This market will resolve to "Yes" if the first Claude Mythos model added to the Arena.AI Leaderboard (arena.ai/leaderboard/text) has at least the specified score at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No". Any Claude model newly added to the leaderboard whose official name includes “Mythos” will qualify. A model whose official name does not include “Mythos” may also qualify if Anthropic officially and unambiguously identifies it as a “Mythos-class” model or substantially similar Mythos variant. Claude models labeled only as Sonnet, Haiku, Opus, or another non-Mythos variant will not qualify unless Anthropic separately provides such official Mythos identification. Results from the "Score" column under the "Text Arena | Overall" Leaderboard tab at https://lmarena.ai/leaderboard/text with style control off will be used to resolve this market. This market will resolve solely based on the specified score in the Score column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. If multiple models are added to the leaderboard on the same calendar date (ET), the highest-scoring model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model’s first appearance will not be considered. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at arena.ai/leaderboard/text. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by December 31, 2026, 11:59 PM ET, this market will resolve to "No".
Kalshi
Mythos resolves to Yes if Anthropic releases a model called Mythos to the public before the specified deadline. The release must be publicly available outside of closed beta testing, though limiting availability to a high-cost subscription tier is acceptable. A Yes resolution can occur on any of the following dates: June 15, 2026; July 1, 2026; August 1, 2026; September 1, 2026; October 1, 2026; November 1, 2026; December 1, 2026; or January 1, 2027. The earliest confirmed public release date determines resolution, with the market resolving Yes upon the first qualifying release event that meets the public availability criteria.
Frequently asked questions
Prediction markets like Polymarket and Kalshi reflect real-money consensus from traders and AI researchers, often incorporating non-public signals and expert intuition faster than published analyst reports. Market odds represent a dynamic, crowd-sourced forecast that updates continuously as new information emerges about Anthropic's development timeline and release strategy. Comparing these live odds to traditional analyst estimates reveals gaps in conviction and highlights where market participants see asymmetric risk relative to mainstream expectations.
Polymarket and Kalshi can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Kalshi and Polymarket serve different trader bases, regulatory jurisdictions, and contract structures, which can create pricing gaps. Kalshi's top outcome focuses on release timing before a specific date, while Polymarket's emphasizes performance threshold at debut. Differences in liquidity, user demographics, and how each platform frames the event can cause odds to diverge by 83.0 or more. Arbitrage opportunities and information asymmetries between venues also drive temporary price discrepancies.
The Claude Mythos: Text Arena Debut market is scheduled to resolve on Jan 1, 2027. Resolution hinges on whether Anthropic officially releases a model named Mythos and whether it appears on the Text Arena Leaderboard, with specific performance thresholds determining final settlement. Traders should monitor Anthropic announcements, Text Arena updates, and official model registrations as the deadline approaches to assess resolution likelihood.
Key catalysts include Anthropic product announcements, Claude model releases, Text Arena leaderboard updates, and public statements about next-generation capabilities. Competitive moves by OpenAI, Google, or other labs may accelerate or delay Mythos development timelines. Regulatory changes, funding news, or technical breakthroughs in language model performance could shift trader conviction. Media coverage of AI benchmarking progress and community discussions on model naming conventions also influence market pricing leading to Jan 1, 2027.
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