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Will the next Fable model (5.2+) debut at a score of at least 1520 by June 30, 2027?

Next Fable Model (5.2+): Text Arena Debut?

Screened using the explicit question date; payout timing still follows the rules.

Provider end date 1 Jul 2027Liquidity $2.8kLifetime volume $11.2kSource Polymarket

Contract resolution rules

AI-assisted explanation

Resolves Yes if the next Anthropic Claude Fable model (5.2+) newly added to the Arena.AI leaderboard has a score ≥1520 at 12:00 PM ET the day after first appearance; otherwise No. Uses the Score column under Text Arena | Overall with style control off. AutoEval models excluded. If multiple models debut same day, highest score used. If removed before the snapshot, not qualifying. If source unavailable for 7 days or no qualifying model by June 30, 2027, resolves No.

Conditions for a winning outcome

A model qualifies if it is newly added to the Arena.AI leaderboard, its name includes 'Fable' (case-insensitive), and its version is 5.2 or higher (e.g., Claude Fable 5.2, Claude Fable 6). The model must not be marked 'AutoEval'. The score used is the value in the Score column under the Text Arena | Overall tab with style control off, at 12:00 PM ET on the calendar date following the date it first appears. If multiple qualifying models debut on the same calendar date (ET), the highest-scoring one is used. The model's prior release or availability outside the leaderboard is irrelevant.

Exclusions and exceptions

A model does not qualify if its name does not include 'Fable' (e.g., Claude Mythos 5.1), or its version is below 5.2 (e.g., Claude Fable 5.1). Models marked 'AutoEval' are excluded. If a model appears on the leaderboard but is removed before 12:00 PM ET the next calendar day and not re-added, it does not qualify. Models added on the calendar date after the initial qualifying model's first appearance are not considered. If no qualifying model is added by June 30, 2027, 11:59 PM ET, the market resolves No.

Timing & resolution

The score is measured at 12:00 PM ET on the calendar date following the date the qualifying model first appears on the leaderboard. If the leaderboard is unavailable at that time, the deadline extends to the first subsequent instance it becomes available, up to 7 days after first appearance. If still unavailable after 7 days, or if no qualifying model appears by June 30, 2027, 11:59 PM ET, the market resolves No.

Ambiguities in the rules

The rules do not specify how to break a tie if two or more models share the identical highest score on the same calendar date (ET). The source says 'the highest-scoring model will be used' but provides no tiebreaker criterion.

AI-assisted explanation of this version of the source rules. It does not replace the provider’s terms.

Original resolution rules
This market will resolve to "Yes" if the next Anthropic Claude Fable model (5.2+) added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) 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". A qualifying model must have a name or model identifier that includes "Fable" and be designated as version 5.2 or higher, regardless of capitalization or surrounding prefixes, suffixes, dates, or descriptors. For example, a version 5.2 or higher named in the same manner as Claude Fable 5 or Claude Fable 5.1 would qualify, including a new whole-number generation such as Claude Fable 6, while models whose name does not include "Fable" or which retain a version designation below 5.2, such as Claude Fable 5.1 or Claude Mythos 5.1, will not qualify. Results from the "Score" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control 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. A model marked "AutoEval" will not be considered added to the leaderboard. Only scores displayed without the "AutoEval" label will be considered. 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. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. 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 https://arena.ai/leaderboard/text/overall-no-style-control. 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 June 30, 2027, 11:59 PM ET, this market will resolve to "No".

Outcome prices and implied probabilities

Compare the quoted price for each outcome. The amounts below assume a $1 payout for a winning share.

Yes56.0%
56.00¢ indicative price per $1 winning payout
No44.0%
44.00¢ indicative price per $1 winning payout

Prices describe trading, not certainty or an independent forecast. Bid / ask for the first outcome: 0.55 / 0.57. Market liquidity is not guaranteed fill size.

Fetched 2026-10-24T13:00:09+00:00 · Provider updated 2026-10-24T12:58:38.586118Z

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